Respuesta :
b. a situation where someone's gain comes at the expense of someone else
Answer:
B. A situation where someone's gain comes at the expense of someone else.
Explanation:
A zero-sum game is a mathematical representation of a situation in which a participant's gain or loss is exactly balanced with the gains or losses of another participant. In other words, the participant's gains only come at the expense of someone else. This game is called "zero-sum" because if you added all the gains and subtracted all the losses, the ultimate result would be zero.