Define opportunity cost you will be marked brainliest answer if you me with one

the loss of potential gain from other alternatives when one alternative is chosen. hope that helped

Opportunity cost means "the loss of potential gain from other alternatives when one alternative is chosen". 

For example, if one company gives you gold but not diamonds, and another gives you diamonds, but not gold, and you choose the diamonds company, then you will miss out on the gold

hope this helps