Question

question 18
a large, bright star whose hot core has used most of its hydrogen is a
o nova.
o supernova.
o giant.
o pulsar.

Explanation:

A giant star is large and bright, and when its hot - core has used most of its hydrogen, it enters the giant phase. A nova is a sudden brightening of a star due to a thermonuclear explosion on its surface. A supernova is a more energetic explosion marking the end of a massive star's life. A pulsar is a highly magnetized, rotating neutron star that emits beams of electromagnetic radiation.

Answer:

C. giant