What Is the Chandrasekhar Limit

What is the Chandrasekhar limit?

A) the time limit of the existence of a planetary nebula, beyond which the nebula dissipates and becomes too rarified to see
B) the time limit for the transfer of mass to a white dwarf in a close binary system, beyond which the white dwarf erupts in a nova
C) the mass limit to the total mass of a white dwarf, beyond which it will erupt in a nova
D) the mass limit to the total mass of a white dwarf, beyond which the electron degeneracy pressure will be overcome and the core will collapse