For Disease resistance purpose which of the following breeding method is conducted?

Answer: Option D

For disease resistance purposes, Backcross breeding and Transgenic breeding both breeding methods is conducted.
Backcross breeding enables breeders to transfer a desired trait such as a transgene from one variety (donor parent, DP) into the favored genetic background of another (recurrent parent, RP).
Genetic improvement of crop plants, domestic animals and useful micro-organisms, through genetic engineering, about their economic use for mankind is referred to as transgenic breeding.