The following information applies to the next 2 problems. Shape in radishes is controlled by a locus with two co-dominant alleles, L is long and L' is round. Combinations of these alleles produce the following phenotypes: LL is long, LL' is oval, L'L' is round. Color in radishes is controlled by another locus on a different pair of chromosomes which has two co-dominant alleles: R is red and R' is white. Combinations of these alleles produce the following phenotypes: RR is red, RR' is purple, R'R' is white. There is a mating between a long, purple plant and a round, red plant. What is the probability (fraction of the offspring) that an offspring will be oval, purple?

a. 1/2
b. 14
c. 3/4
d. 3/8
e. none of these