Convergent evolution according to my records
Frameshift mutation affects codons downstream the point of mutation. The previous order of 3 nucleotide- sequences (codons) is consequently changed. This, therefore, changes the protein coded by the mRNA transcribed by the mutated DNA region. Frameshifts are mostly due to insertion or deletion mutations.
D. Differences in the amount of recent exercise seems the most accurate however the answer could be any of them.
But my guess is D