Within the Deep Interior of the Sun, Which Development Will

Multiple Choice

Within the deep interior of the Sun, which development will eventually lead to major changes as the Sun evolves off the main sequence toward the red giant phase of its life?

A) expansion of the core by the buildup of hydrogen in the nuclear furnace, pushing the outer regions of the Sun outward
B) the supernova explosion that will occur when the buildup of helium in the core exceeds a certain critical amount
C) slowing down of the nuclear furnace as the central core temperature drops with time
D) buildup of inactive helium by the transformation of hydrogen in the thermonuclear furnace