Answer :
A hydrogen bomb differs from an atomic bomb because it is smaller but more powerful. The answer to your question is A. I hope that this is the answer that you were looking for and it has helped you.
Answer:
It is smaller but more powerful.
Its nuclear reaction is easier to control.
Explanation:
Hydrogen bomb is based on the nuclear fusion while the atom bomb is based on the nuclear fission.
In atom bomb, we use the radioactive materials while the fuel used in hydrogen bomb is not radioactive.
Hydrogen bomb is smaller in size rather than atom bomb.
Hydrogen bomb is easier to control.