In the mid 1930s Enrico Fermi bombarded uranium with thermal neutrons and observed the release of a large amount of energy. This happened because the heavy uranium nucleus split into two lighter nuclei, releasing two or three neutrons along with a large amount of energy.

What is this process called?
Responses
A nuclear fusionnuclear fusion
B nuclear fissionnuclear fission
C nuclear synthesisnuclear synthesis
D nuclear unification