Question

what happens first when a star begins to run out of fuel?
○ the star’s core shrinks.
○ the star becomes a black hole.
○ the star becomes a white dwarf.
○ the star’s outer layer drifts away.

Explanation:

When a star depletes its core fuel, the outward pressure from nuclear fusion disappears. Gravity then causes the star's core to contract immediately; the other options are later stages that only occur for specific star masses after the core shrinks first.

Answer:

The star's core shrinks.