Which best describes a chain reaction associated with a nuclear reaction?
a. neutrons released during a fusion reaction cause other nuclei to fuse.
b. neutrons released during a fission reaction cause other nuclei to split.
c. helium nuclei released during a fission reaction cause other nuclei to split.
d. helium nuclei released during a fusion reaction cause other nuclei to fuse.

The correct option is B.

There are two types of nuclear reaction, these are fusion and fission reactions. Fusion reaction involves the coming together of two or more nuclei to form one or more different atomic nuclei and some sub particles. Nuclear fission reaction on the other hand involves the splitting of an atomic nuclei into smaller parts. Thus, is it fission reaction that involves the splitting of atomic nuclei.

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