The nuclear reaction that occurs by combining two or more lighter atoms into a larger one is called what?
a. nuclear fusion
b. nuclear fission
c. beta emission
d. alpha emission

The nuclear reaction that occurs by combining two or more lighter atoms into a larger one is called nuclear fusion. As a result of this reaction a huge amount of energy is released.  
Nuclear fission is the opposite process of nuclear fusion when the atom splits into several smaller atoms.

500bc indiais the answer.

Ithinks its false. tell me if im wrong