When a Star Consumes All of the Energy It Can

Multiple Choice

When a star consumes all of the energy it can from hydrogen fusion in its core, the next long-term energy-producing phase is

A) helium fusion in the core.
B) helium fusion in a shell around the core.
C) hydrogen fusion in a shell around the core.
D) gravitational energy released in a Kelvin-Helmholtz condensation.