The correct option is
C intergeneric cross
Protoplast fusion is a type of genetic modification in plants by which two distinct species of plants are fused together to form a new hybrid plant with the characteristics of both, a somatic hybrid. Hybrids have been produced either between different varieties of the same species (e.g. between non-flowering potato plants and flowering potato plants) or between two different species of the same genus and hence intergeneric cross(e.g. between wheat triticum and rye secale to produce Triticale).