The correct option is D Back cross
Backcross is crossing of a hybrid with one of its parents or an individual genetically similar to its parent, in order to achieve offspring with a genetic identity which is closer to that of the parent. Back cross is done multiple times to create pure lines of organisms. Test cross involves mating of the F1 offspring with the recessive parent, this is carried out to identify the genotype of the hybrid. A monohybroid cross describes the cross between individuals differing in a single trait. Reciprocal cross is a pair of crosses between a male of one strain and a female of another, and vice versa.