If the positive integer $x$ is a multiple of $4$ and the positive integer $y$ is a multiple of $6,$ then $xy$

If the positive integer $x$ is a multiple of $4$ and the positive integer $y$ is a multiple of $6,$ then $xy$ must be a multiple of which of the following?

I. 8
II. 12
III 18

A) II only
B) I and II only
C) I and III only
D) II and III only
E) I, II and III

Answer: B

Source: Official Guide

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