(b) Only one
The first Law commission was created by the Charter Act of 1833 and had the authority to investigate and report. The commission’s recommendations led to the codification of the Criminal Procedure Code and the Penal Code. The commission also suggested various enactments to the British government (Statement 1 is incorrect).
The Law Commission of India is a non-statutory (Executive) body, constituted by the Government of India from time to time. The Commission was originally constituted in 1955 and is re-constituted from time to time (Statement 3 is incorrect).
The 22nd Law Commission of India (Latest) is chaired by Justice Rituraj Awasthi, a former Chief Justice of the Karnataka High Court.

(b) Only two
Statements 1 and 2 are correct
The Parliament (Prevention of Disqualification) Act, 1959 exempts several posts from disqualification, like:
Ministers of State and Deputy Ministers, Parliamentary Secretaries and Parliamentary Under Secretaries, Deputy Chief Whips in Parliament, Vice-Chancellors of Universities, Officers in the National Cadet Corps, and the Territorial Army, and Chairman and members of Advisory Committees set up by the Government when they are not entitled to any fee or remuneration other than compensatory, etc.
The term is used in Article 102 (1)(a) of the Indian Constitution which bars a member of the Indian Parliament from holding an office that would give its occupant the opportunity to gain a financial advantage or benefit. It refers to a post under central/state government which yields salaries, perks and other benefits.
The law does not clearly define what constitutes an office of profit but the definition has evolved over the years with interpretations made in various court judgments (Statement 3 is incorrect)

(a) Only one
Statements 2 and 3 are correct
Multilateral Development Banks are institutions whose members include multiple developed and developing countries, which have to fulfill certain lending obligations to facilitate developmental objectives (Statement 1 is incorrect).
Multilateral development banks are subject to international law. They and other international financial institutions, such as the International Monetary Fund (IMF), originated in the waning days of World War II when the United States and its allies established the Bretton Woods institutions to rebuild war-ravaged nations and stabilize the post-war international financial system. The World Bank, which has been semi-officially dominated by the U.S. since its founding, is one of these institutions.
Unlike commercial banks, MDBs do not seek to maximize profits for their shareholders. Instead, they prioritize development goals, such as ending extreme poverty and reducing economic inequality. They often lend at low or no interest or provide grants to fund projects in infrastructure, energy, education, environmental sustainability, and other areas that promote development.

(a) Only one
Statement 1, 2 and 3 are correct.
The GST Appellate Tribunal can choose to refuse an appeal if the involved amount (of tax, ITC, fine, fee or penalty) is lower than Rs. 50,000. (Statement 4 is incorrect).
The Central Goods and Service Tax Act, 2017 (CGST Act) in Section 109 mandates for the constitution of a GSTAT and its Benches.
The GSTAT will be the specialized appellate authority for resolving disputes under the GST laws.
Composition:
The GST Tribunal will have one principal bench in New Delhi and as many benches or boards in states as decided by each state, subject to approval of the council. North-eastern states could opt for one bench for 2-3 states and an additional bench for very far-flung areas. The principal bench and state boards would have two technical and two judicial members each, with equal representation from the Centre and states. All four members would not sit for hearing each case. It depends on the threshold or value of dues involved.