A ZAMS Star Evolves __________ and to the __________ on the H-R

Multiple Choice

A ZAMS star evolves __________ and to the __________ on the H-R diagram because ________________.

A) downward, left, the core expands which causes the outer layers to expand
B) upward, right, the core contracts which causes the outer layers to expand
C) upward, left, the core expands which causes the outer layers to contract
D) downward, right, the core contracts which causes the outer layers to contract