How would you describe the sequence of reactions in a hydrogen bomb

A hydrogen bomb is a  nuclear bomb, like an atomic bomb, where the explosive energy comes from as nuclear reaction.  

A hydrogen bomb is about fusion — fusing atomic nuclei together to combine into bigger ones.

A hydrogen bomb, or a thermonuclear bomb, contains a fission weapon within it but there is a two-stage reaction process.

The U.S. used two atomic bombs in World War II against Japan, Then, in 1952 and 1954

In particular, monitors will be looking for isotopes of a gas called xenon, which is typically present in H-bomb reactions.

the answer is 1 i believe