As a Low-Mass Main-Sequence Star Runs Out of Fuel in Its

Multiple Choice

As a low-mass main-sequence star runs out of fuel in its core, it grows more luminous. How is this possible?

A) It explodes.
B) It begins to fuse helium in the core.
C) The core expands as it runs out of fuel.
D) The core shrinks, bringing more hydrogen fuel into the burning region.
E) Convection takes place throughout the interior, bringing more fuel to the core.