From the time a star of more than 1 solar mass reaches the ZAMS until it leaves the main sequence,the star's evolution on the main sequence is:
A) upward and to the left, along the main sequence.
B) down and to the left, toward the white dwarves.
C) upward and to the right, but only very slightly.
D) straight upward as its luminosity increases.
Correct Answer:
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