The Nuclear Fusion Reactions Involved in the CNO Cycle Require

Multiple Choice

The nuclear fusion reactions involved in the CNO cycle require much higher temperatures than the reactions within the proton-proton chain because

A) carbon nuclei can exist only at extremely high temperatures.
B) reactions involving a catalyst can only occur at higher temperatures.
C) low-mass stars do not have convective cores.
D) neutrinos can only survive at temperatures where the CNO cycle is possible.
E) nuclei with higher number of protons have a greater repulsive barrier against protons,
So particles need to move fast to overcome it.