Choose from the List Below for the Following Questions

Multiple Choice

Choose from the list below for the following questions.You may use a choice more than once.
-When a 1-solar-mass star stabilizes as a giant for about a billion years,which method of energy generation occurs in its central core?

A) H fusion by the proton-proton chain
B) H fusion by the CNO cycle
C) helium fusion
D) matter-antimatter annihilation
E) gravitational contraction