How many integers between 1 and 16, inclusive, have exactly 3 positive integer factors? (Note: 6 is NOT such an integer

Source: Official Guide

How many integers between 1 and 16, inclusive, have exactly 3 different positive integer factors? (Note: 6 is NOT such an integer because 6 has 4 different positive integer factors: 1, 2, 3, and 6.)

A. 1
B. 2
C. 3
D. 4
E. 5

The OA is B

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