During the cold war arms race, how did the hydrogen bomb differ from the atomic bomb

The Hydrogen Bomb uses fusion and fusion is more powerful than Fission which was used in Atomic Bombs. The Hydrogen Bomb was more destructive than the Atomic Bomb . Both are nuclear weapons but Hydrogen has more power and that is how it Differed from the Atomic bomb during the Cold war arms race.

Ibelieve the answer is the  third option, or c.

Asa whitney was the first to advocate for a transcontinental railroad.