Jonathan Is on His School's Cross-Country Ski Team

Jonathan is on his school's cross-country ski team. He finds that his weight drops about 1 pound after skiing for a few hours. What accounts for this difference?

A) Jonathan has lost one pound of body fat.
B) Jonathan has lost one pound of muscle tissue.
C) Jonathan has lost two cups of fluid.
D) Jonathan has lost some bone and some fat.
E) Jonathan has lost primarily fat and some glycogen.