Which of the Following Is an Example of the Concept

Which of the following is an example of the concept known as dissociation?

A) Mood-congruence effects are usually stronger than mood-incongruence effects.
B) Many people perform well on implicit memory tasks, even when they perform poorly on explicit memory tasks.
C) Depressed people recall unpleasant material better than pleasant material, whereas non-depressed people recall pleasant material better than unpleasant material.
D) Mood-congruence effects are fairly strong, whereas implicit-memory effects are inconsistent and not very strong.