Biology

The correct answer is: D.Insertions and Deletions

Explanation:

A frameshift mutation occurs when the number of nucleotides inserted or deleted is not a multiple of three, causing a shift in the reading frame of the genetic code. This can drastically alter the sequence of amino acids in the resulting protein.

Insertions and Deletions: Both insertions and deletions can cause frameshift mutations if they involve the addition or removal of nucleotides in numbers that are not multiples of three.