Lagina walks into a room and feels as if she has been there before, even though she knows that she has not. lagina’s experience of deja vu may be explained by which concept from classical conditioning?

This is an example of stimulus generalization. She is taking the thought that she's been in one type of room and generalizing it to any similar space, and the feeling is reminding her of past events. She has been conditioned through the older stimulus to remember the feelings and thoughts she had when she was in the room in the past.