The correct answer is (c) S. Chandrashekhar.
S. Chandrashekhar was an Indian astrophysicist who made significant contributions to the theory of stellar structure and evolution. In 1935, he derived the Chandrasekhar limit, which is the maximum mass that a stable white dwarf star can have. If a star exceeds this mass, it will collapse into a black hole.
Herman Bandy was an American astronomer who made significant contributions to the study of variable stars. Megh Nath Saha was an Indian physicist who made significant contributions to the theory of statistical mechanics. J.V. Narlikar was an Indian astrophysicist who made significant contributions to the study of cosmology.
Herman Bandy, Megh Nath Saha, and J.V. Narlikar did not make any significant contributions to the theory of black holes.