(c) 1, 2, 3 and 4 only
Karnataka is the first state in India to declare snakebite a notifiable disease.
India is responsible for nearly half of the world’s snakebite deaths, and the actual number of snakebites is likely underreported. The declaration is part of the National Action Plan for Prevention and Control of Snakebite Envenoming (NAPSE), which aims to reduce snakebite deaths by half by 2030.
A notifiable disease is any disease that is required by law to be reported to government authorities. The collation of information allows the authorities to monitor the disease, and provides early warning of possible outbreaks. Notifiable diseases are of public interest by reason of their contagiousness, severity, or frequency.
List of Notifiable diseases in India: AIDS, Dengue fever, Hepatitis B, Malaria, Whooping cough (Pertussis), Rabies, Tetanus, Viral encephalitis, Anaemia, Chickenpox, Diphtheria, Influenza, Measles, Plague, Smallpox, Tuberculosis, Malnutrition, Iodine deficiency, Cholera, Hepatitis A, Leprosy, Cerebro, spinal fever, Polio, Scarlet fever, Typhoid fever, Vitamin A deficiency.

(c) All three statements are correct
The concept of “One Nation, One Election” indeed proposes holding simultaneous elections for the Lok Sabha and all State Legislative Assemblies to streamline the electoral process and reduce the frequency of elections.
First General Elections to the House of People (Lok Sabha) and all State Legislative Assemblies were held simultaneously in 1951-52.
That practice continued in three subsequent General Elections held in the years 1957, 1962 and 1967. However, due to the premature dissolution of some Legislative Assemblies in 1968 and 1969, the cycle got disrupted.
In 1970, the Lok Sabha was itself dissolved prematurely and fresh elections were held in 1971. Thus, the First, Second and Third Lok Sabha enjoyed full five-year terms.
The term of the Fifth Lok Sabha was extended till 1977 under Article 352. After that, the Eighth, Tenth, Fourteenth and Fifteenth Lok Sabha could complete their full five-year terms. The Sixth, Seventh, Ninth, Eleventh, Twelfth and Thirteenth Lok Sabha was dissolved prematurely.
Simultaneous elections were the norm in India until 1967. The cycle was disrupted due to the premature dissolution of some Legislative Assemblies and the Lok Sabha.
Implementing “One Nation, One Election” would require several constitutional amendments, including changes to Articles 83, 172, and the introduction of a new Article 324A.

(c) Both 1 and 2
In Anoop Baranwal vs Union of India, the Supreme Court (SC) ruled that the appointment of the Chief Election Commissioner (CEC) and Election Commissioners (EC) by the President will be based on the advice of a three-member high-level committee.
Article 324 (2) – President shall with aid and advice of Council of Ministers, appoint CEC and ECs, till Parliament enacts a law fixing the criteria for selection, conditions of service and tenure.

(b) C. Rajagopalachari
Chakravarti Rajagopalachari, popularly referred to as Rajaji, was born on 10 December 1878 in Thorapalli, Tamil Nadu.
Rajaji’s personal interaction with Gandhi in 1919 led him to give up his legal profession to be fully involved in the nation’s independence struggle.
He participated in agitations against the Rowlett Act, the Non-Cooperation movement, the Vaikom Satyagraha, and the Civil Disobedience Movement.
For these activities, between 1912 and 1941, as a result of which he was jailed five times. Rajaji was elected to the Constituent Assembly from Madras on a Congress party ticket. In the Assembly, he intervened on the issues of religious freedom and citizenship.
In 1954 he was conferred with the Bharat Ratna for his contribution to Indian politics and literature.

(b) 1-3-2-4
Irrigation efficiency is the ratio between the amount of water used up by the crop to meet its consumption requirement and the amount of water needed to keep the salt balance in check. The depth and texture of the soil also have an important role to play.
When the soil is of the right depth and texture, fertilizers and minerals can evenly reach to the ground.
Clay has the highest proportion of organic matter. It has the highest porosity and lowest permeability. Therefore, the wet clods formed are highly stable.