The correct answer is C. This is complicated to explain, but all I did was take numbers that have a product of 50. Two numbers that have a product of 50 are 25 and 2. 2 cannot be multiplied by anything except 1, but 25 can. That would be 5 and 5. 5 and 5 are pairs, so you just put 5 to the left. This leaves 2 left.
