In a study by Posner, Welton, & Goldsmith (1967), participants saw a bunch of dot patterns, and then later had to classify them as previously seen or unseen

When participants saw a dot pattern that resembled all of the
other ones, but that wasn't presented, they still tended to classify it as previously seen. This finding supports:
a) exemplar approach.
b) the essentialist view.
c) prototype approach.
d) the classical view.

Answer: c