From the Relative Positions of Genes on the Chromosome Illustration

Multiple Choice

From the relative positions of genes on the chromosome illustration below, we expect

A) the highest frequency of crossing over between genes A and D.
B) more crossing over between C and D than between A and B.
C) more crossing over between A and B than between B and C.
D) the lowest frequency of crossing over between B and C.
E) none of these.