Answer: Option (A) is the correct answer.
Explanation:
Nuclear fission is a process in which a heavy radioactive nucleus splits into two or more smaller nuclei.
For example, [tex]^{235}_{92}U + ^{1}_{0}n \rightarrow ^{236}_{92}U\rightarrow ^{92}_{36}Kr + ^{141}_{56}Ba + 3^{1}_{0}n[/tex] is a nuclear fission reaction.
Whereas in a nuclear fusion reaction two small nuclei combine together to result in the formation of a heavy nuclei.
For example, [tex]^{2}_{1}H + ^{3}_{1}H \rightarrow ^{4}_{2}He + ^{1}_{0}n + Energy[/tex]
Thus, we can conclude that one way in which fission differs from fusion is that fission splits nuclei, fusion combines nuclei.
