Why Does the CNO Cycle Not Occur in Low-Mass Stars

Multiple Choice

Why does the CNO cycle not occur in low-mass stars?

A) Low-mass stars do not have enough carbon, nitrogen, and oxygen.
B) Low-mass stars do not live long enough to reach this stage.
C) Low-mass stars do not have high enough temperatures in their cores.
D) Low-mass stars do not have enough convection to cycle elements.