In Iceland the Skipper Effect Is

In Iceland the skipper effect is:

A) a neurological disorder that causes people to not walk normally
B) a speech impediment that causes people to leave out words
C) a skill people can develop so they can skim flat rocks or shells across the surface of water at least four times in a single skip
D) the contribution of the skipper to the catch of a fishing boat
E) the amount your grade goes down because you didn't attend all classes