Phenotypes and Genotypes

From a cross between individuals with phenotypes AB and ab, the offspring show 50% phenotypes Ab and 50% phenotypes aB. What is the genotype of the parents with phenotype AB?

A) AaBb for linked traits
B) AABb for independent traits
C) AaBb for independent traits
D) AABb for linked traits
E) Aabb for linked traits

The answer is A.