Which Statement Describes State-Dependent Learning

Which statement describes state-dependent learning?

A) State-dependent learning means that physical conditions can be a strong cue for subsequent memory retrieval.
B) State-dependent learning refers to how memory can be increased with the use of drugs.
C) State-dependent learning refers to the fact that happy people have better memories.
D) State-dependent learning means that adults lose eidetic memory as they grow older.