B. RNA interference is not a type of mutation as RNA interference, or PTGS show that it is involved in initiation of RNAi, also the rest are gene mutations as in A. A base is substituted for a different base, therefore coding for the wrong protein. C. Is gene mutation because you are adding a new base to code again, for a different protein. D. Is gene mutation because two different DNA strands switch two different sections. For ex. ABCDEF GHIJKL. Result- ABCJKL GHIDEF. Different parts of the codons have been moved to different locations known as translocation.