Question

the explosion of a massive star near the end of its life is known as a
nova
nebula
protosun
supernova

Explanation:

A nova is a sudden brightening of a star due to a thermonuclear explosion on its surface. A nebula is a giant cloud of dust and gas in space. A protosun is a young star in the process of formation. A supernova is the explosion of a massive star at the end of its life, releasing a huge amount of energy and light.

Answer:

D. supernova