Which situation is modeled by the equation below?

100 + (-100) = 0

A. winning $100 in a contest, then paying a $100 electric bill

B. winning $100 in a contest, then donating half of it to a charity

C. paying $100 for a video game system, then paying $100 more for video games

D. paying $100 for a video game system, then selling it to someone else for $200