AMC 8 2015 Problem 12

How many pairs of parallel edges, such as $\overline{AB}$ and $\overline{GH}$ or $\overline{EH}$ and $\overline{FG}$, does a cube have?

$\text{(A) }6 \text{(B) }12 \text{(C) } 18 \text{(D) } 24 \text{(E) } 36$