In a White Dwarf, What Is the Source of Pressure

Multiple Choice

In a white dwarf, what is the source of pressure that halts its contraction as it cools?

A) thermal pressure of the extremely hot gas
B) electrons packed so closely that they become incompressible
C) neutrons that resist being pressed further together
D) carbon nuclei that repel each other strongly because they each contain six protons
E) rapid rotation