Answer:
The correct answer is neutron moderation.
Step-by-step explanation:
Neutron moderation refers to the procedure in a nuclear reaction, in which nuclear reaction functions to slow down the fast neutrons generated due to the dissociation of the atoms in the fissile components like uranium-235, in order to make them more efficient in the fission chain reaction. This moderation or slowing of the neutrons permits them to be more easily captivated by the fissile nuclei, producing more fission occurrences.