Which of the following is a star that expands due to fusion?

A. black hole

B. galaxy

C. constellation

D. supergiant

A). No. A black hole is super contracted, not expanded.

B). No. A galaxy is a collection of billions and billions of stars.

C). No. A constellation is just some stars that happen to be

near each other in our sky.

D). Yes. A supergiant used to be a normal star but has expanded giantly.