In German cockroaches, bulging eyes (bu) are recessive to normal eyes (bu+) and curved wings (cv) are recessive to straight wings (cv*). These two traits are encoded by autosomal genes that are linked. A cockroach has genotype bu+ bucv+ cv, and the genes are in repulsion. Which of the following sets of genes will be found in the most common gametes produced by this cockroach? 

a. bu+ cv+ 

b. bucv 

c. bu+ bu 

d. cv+cv 

e. bucy+

Explain your answer.