When the Temperature of the Sun's Core Goes Down, What

Multiple Choice

When the temperature of the Sun's core goes down, what happens next?

A) Fusion reactions slow down; the core expands and heats.
B) Fusion reactions speed up; the core shrinks and cools.
C) Fusion reactions slow down; the core shrinks and heats.
D) Fusion reactions speed up; the core expands and cools.