The tendency to recall information better if one is in the same pharmacological or psychological state as when the information was encoded is known as

The tendency to recall information better if one is in the same pharmacological or psychological state as when the information was encoded is known as: State-dependent memory effect
Our memories are interconnected with another. So, if we're exposed to a similar environment when an information was encoded, it will trigger the correlation inside our memory which could make that memory appear to the surface

Icould be wrong but i would say b.