According to the mere exposure effect, we are most likely to feel attracted to people when:

a. they are very similar to us.

b. they are very different from us.

c. we have never met them before.

d. we have met them on previous occasions.

I think it is a.

I was going to agree with you -- until I researched the mere exposure effect.

Check it out.

http://psychcentral.com/encyclopedia/2009/mere-exposure-effect/

I guess it is d.

Right.

The answer is (D), "We have met them on previous occasions."

The mere exposure effect refers to the phenomenon where people tend to develop a preference for things or people that they are exposed to more often. In the context of this question, it suggests that we are most likely to feel attracted to people when we have met them on previous occasions, option d.

To arrive at this answer, we can eliminate options c and b. The mere exposure effect suggests that familiarity increases attraction, so meeting someone for the first time (option c) would not have the same impact. Additionally, the effect does not indicate a preference for people who are very different from us (option b).

Now, we are left with options a and d. While it is true that familiarity can contribute to attraction, the mere exposure effect specifically relates to repeated exposure. Therefore, the answer is d, as meeting someone on previous occasions aligns with the concept of repeated exposure leading to increased attraction.