Which of the following best describes a nuclear fusion reaction?
a reaction that forms chemical bonds
a reaction that breaks chemical bonds
a reaction that joins the nuclei of two atorns into one
a reaction that splits the nucleus of an atom into two
latinu
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A reaction that joins the nuclei of two atoms into one  

Explanation:

Think of the words "nuclear fusion".

Nuclear = "relating to a nucleus"

Fusion = "joining"

So, nuclear fusion is the joining of two nuclei into one.

A and B are wrong, because chemical reactions involve electrons.

D is wrong, because the splitting of a nucleus is fission.

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