Ascospores from a Cross of C $\times$ D E (All Auxotrophic Markers)are Analyzed

Multiple Choice

Ascospores from a cross of c $\times$ d e (all auxotrophic markers) are analyzed.If genes c and d are linked,10 map units apart,but gene e is located on a different chromosome,what proportion of ascospores is expected to be c⁺d⁺e⁺?

A) about 1%
B) about 2.5%
C) about 5%
D) about 40%
E) about 50%