While taking his clothes out of the dryer, Charles finds a sock clinging to his sweater.

What is the best explanation for this common phenomenon?
A. In the dryer, both the sock and the sweater lost electrons.
B. In the dryer, both the sock and the sweater gained electrons.
C. In the dryer, either the sock or the sweater gained electrons while the other item lost electrons.
D. The cause of static cling is an unsolved scientific mystery.