Complete linkage is found in

The correct option is C Male Drosophila
Complete linkage is defined as the state in which two loci are so close together that alleles of these loci are virtually never separated by crossing over. In the case of male Drosophila there is a complete absence of recombinant types due to the absence of crossing over. This means that all of the genes that start out on a single chromosome, will end up on that same chromosome in their original configuration.

So, the correct answer is 'Male Drosophila'.