Mood-congruent memory refers to the effect of emotional states on the process of

Retrieval

Explanation:

Mood-Congruent Memory is simply an indication that as memories are stored by humans, they store both the events and a memory of the mood that they were in at the time of the memory storage. It is for this reason that when a person is happy, he retrieves or recall other memories of happiness. This also applies when a person is depressed as other unhappy events are also retrieved.