(d) All four
Mohandas K. Gandhi (1869-1948) attributes the success of the final phase of the satyagraha campaign in South Africa between 1908 and 1914 to the “spiritual purification and penance” afforded by the Tolstoy Farm.
The Tolstoy Farm was the second of its kind of experiments established by Gandhi. The first, the Phoenix settlement in Natal, was inspired in 1904 by a single reading of John Ruskin’s Unto This Last, a work that extolled the virtues of the simple life of love, labour, and the dignity of human beings. Gandhi was not as personally involved in the daily running of the Phoenix settlement as he was to become in his stay of interrupted duration at the Tolstoy Farm which lasted for about four years. In part this was because the political struggle had shifted to the Transvaal after 1906, and he controlled it from its Johannesburg headquarters.
He devotes a considerable number of pages in Satyagraha in South Africa to the discussion of the day-to-day activities on the farm as the experiment appeared important to him, even though it had not enjoyed much “limelight”
He wrote: “I have serious doubts as to whether the struggle could have been prosecuted for eight years, whether we could have secured larger funds, and whether the thousands of men who participated in the last phase of the struggle would have borne their share of it, if there had been no Tolstoy Farm.”

(d) Japan, with advanced technology for spent fuel reprocessing and waste management.
Though India engages with Japan on nuclear research, waste management collaborations involve countries like France and Canada.

(c) All three
Robert Clive was a soldier and first British administrator of Bengal, who was one of the creators of British power in India. In his first governorship (1755–60) he won the Battle of Plassey and became master of Bengal. In his second governorship (1764–67) he reorganized the British colony.

(c) Only three
XPoSat is a collaboration between the Indian Space Research Organisation (ISRO) and the Raman Research Institute (RRI) (Statement 1 is incorrect).
XPoSat (X-ray Polarimeter Satellite) is India’s first dedicated polarimetry mission to study various dynamics of bright astronomical X-ray sources in extreme conditions. The spacecraft will carry two scientific payloads in a low earth orbit. The primary payload POLIX (Polarimeter Instrument in X-rays) will measure the polarimetry parameters (degree and angle of polarization) in medium X-ray energy range of 8-30 keV photons of astronomical origin. The XSPECT (X-ray Spectroscopy and Timing) payload will give spectroscopic information in the energy range of 0.8-15 keV.
The emission mechanism from various astronomical sources such as blackhole, neutron stars, active galactic nuclei, pulsar wind nebulae etc. originates from complex physical processes and are challenging to understand.

(b) Only two
Black holes are indeed cosmic objects with incredibly strong gravitational pull, so strong that not even light can escape their grasp. This point accurately reflects the established definition of black holes.
In April 2019, the Event Horizon Telescope (EHT) collaboration successfully captured the first-ever image of a black hole, specifically the Sagittarius A* located at the center of our Milky Way galaxy. This marked a significant milestone in astronomical observation and provided valuable insights into the nature of black holes.
While the concept of wormholes connecting different areas of spacetime is a fascinating subject in theoretical physics, there is no concrete evidence of their existence within black holes or elsewhere in the universe. This statement introduces a hypothetical concept not yet supported by conclusive observations or experiments (Statement 3 is incorrect).