Deletion mutations in the type of frameshift mutation. thus option D is the correct option.
What do you mean by frameshift mutation?
An insertion or deletion that changes the protein's entire reading frame is known as a frameshift mutation, and it has the potential to be very dangerous.
Frameshift mutations are deletions or additions of 1, 2, or 4 nucleotides that change the ribosome reading frame and result in premature translation termination at a new nonsense or chain termination codon (TAA, TAG, and TGA).
Learn more about frameshift mutation here:
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