Correct Option: B

Transgenics is based on insertion of foreign genes from a different species, or deletion of existing nucleotides from the gene sequence in normal host cells. Also substitution of bases by transition( Pu by Pu/ Py by Py) or transversion( Pu replaced by Py of vice-versa). Usually, the process of random gene rearrangement is not included in transgenic experiments, because it is a natural process not yielding desired transgenic traits. Thus, in actual practice, insertion, deletion and/or substitution is used for yielding transgenics.