Chan came home quite drunk from a party on saturday night. luckily he was given a ride home. he threw his apartment keys down somewhere and immediately fell asleep. he may not be able to find his keys again until he is once again drunk because of memory.

The correct answer is state-dependent memory.

State-dependent memory refers to the phenomenon in which individuals are more likely to be able retrieve memories when they are in the situation, location or condition in which the memory was first formed. In this instance, Chan's memory of where he dropped his keys was first formed when he was drunk in his apartment, and thus, he will be more likely to recall where his keys are when he is drunk next and in his apartment.