In classical conditioning, occurs when a stimulus similar to the conditioned stimulus fails to evoke the conditional response.

Stimulus Discrimination

Explanation:

Stimulus discrimination is to respond differently to two or more than two stimuli.In classical conditioning, a stimulus similar to the conditioned stimulus fails to evoke the conditioned response, then it occurs.In operant condition, it occurs when an organism make a response in the presence of other, similar stimuli that differ from it on some dimension.Stimuli that are similar but differ in some dimensions.

The answer would be c, white eyes are homozygous recessive. in the early 1900s, morgan conducted several experiments with vinegar  flies (drosophila). one  sample revealed an anomaly: a  white-eyed, single male fly. he attempted to breed this fly with the typical red-eyed females. the offspring were all red-eyed. using flies from this new generation (brother-sister pairs)  produced some red-eyed and a few white-eyed flies. the white-eyed were all male. in later experiments, he was able to produce white-eyed females. this proved that white eyes are not lethal to either sex (ruling out a and b). since the percentage of white eyes to red eyes is so low, white eyes are not a dominant trait. it would be a recessive trait.