Question

a star produces energy by:
a. creating helium from hydrogen in its core.
b. absorbing and releasing the matter of other stars.
c. reflecting energy from nearby stars.
d. rotating quickly on its axis.

Explanation:

Stars produce energy through nuclear fusion. In their cores, hydrogen atoms combine to form helium, releasing a large amount of energy. This is the main energy - generating process in stars. Options B, C, and D are not the main ways stars produce energy.

Answer:

A. creating helium from hydrogen in its core.