The correct answer would be A, or 2 x 2 x 2 x 3 x 3. This multiplies out to be 72. I arrived at this answer by first dividing 72 by 6, which left me with a 6 and a 12 to be factored. 12 was then factored into 6 and 2.
The two sixes were factored into two and three. This left me with three twos and two threes. Therefore, I chose answer A. The other answers are all wrong for a variety of reasons.
For example, answer B isn’t fully factored; there’s still a 6 there. Answer C has an extra three. Answer D is just all over the place - it has a nine and what looks to be an extra three.