Lem is looking at new cars. each one he sees has a certain trim detail across the hood which he somewhat likes at the start of the day. at the end of the day, and fifteen cars later, he really likes the detail. his opinion is influenced by the
a. stimulus generalization effect. b. mere exposure effect. c. familiarity effect. d. proximity effect.

Lem's opinion is influenced by the mere exposure effect, wherein one develops a preference or liking for something on the basis that they are familiar with that something. Here, Lem is familiar with something at the start of the day (the detail), and he continues to like that detail at the end of the day because of this effect.

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Explanation:

which ever one is showing doing the same exercise in time intervals such as 30 seconds or a minute several times.