The correct answer is: B. Chandrasekhar limit
The Chandrasekhar limit is the maximum mass of a stable white dwarf star. Beyond this limit, electron degeneracy pressure cannot support the star against gravitational collapse.
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The Chandrasekhar limit is named after Indian astrophysicist Subrahmanyan Chandrasekhar, who first calculated it in 1931. The limit is approximately 1.4 solar masses, which is the mass of the Sun.
If a white dwarf star has a mass greater than the Chandrasekhar limit, it will collapse under its own gravity. This collapse can lead to a supernova explosion, or the formation of a neutron star or black hole.