Carbon fusion occur in high-mass stars but not in low-mass stars because
A. the cores of low-mass stars never contain significant amounts of carbon.
B. the cores of low-mass stars never get hot enough for carbon fusion.
C. only high-mass stars do fusion by the CNO cycle.
D. carbon fusion can occur only in the stars known as carbon stars.
Answer:B
Carbon fusion occur in high-mass stars but not in low-mass stars because
A. the cores of low-mass stars never contain significant amounts of carbon. B. the cores of low-mass stars never get hot enough for carbon fusion. C. only high-mass stars do fusion by the CNO cycle. D. carbon fusion can occur only in the stars known as carbon stars.