Number Properties Problem Solving : Factors

Here is an interesting GMAT number property problem solving question. Concept tested : number of factors.

Integer x has n factors; 3x has 3 factors; Which of the following values can n take?

I. 1
II. 2
III. 3

A. I only
B. II only
C. I or II
D. II or III
E. I or III

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