IMO B.

Keep drawing socks while trying to avoid picking a pair in each draw. At some point you will have to pick a sock that completes a pair. Continue till you have 4 pairs. I could come up with the following.

possible sequence(s):
R, B, W, R, B, W, R, B, W, R [4 pairs]
R, B, W, R, R, R, R, R, R, R [ 4 pairs]

OA Pls?!?

I can't explain the theory or correct way to do it, but I would imagine that the answer has to be 12.

Red Red Red Red Red Red Red Red Red Red Red Red

Blue Blue Blue Blue Blue Blue Blue Blue Blue Blue Blue Blue

White White White White White White White White White White White White

the longest way to get to four pairs is if you keep drawing a different color sock. If you do this just cross off one of each color until you have 4 pairs and you would have drawn 12 different socks.