which object is created during the formation of a star? a nebula a protostar a supergiant a supernova

which object is created during the formation of a star? a nebula a protostar a supergiant a supernova
Answer
Brief Explanations:
Stars form from the gravitational collapse of a nebula. During the early - stage of star formation, a protostar is created as the material in the nebula starts to coalesce under gravity. A supergiant is a late - stage massive star, and a supernova is the explosive death of a massive star.
Answer:
B. a protostar