Ann can buy either a pair of jeans or shoes with the allowance she saved up. what is the opportunity cost if she buys the jeans?

The opportunity cost that Ann is going to have if she buys the pair of jeans is the chance to buy the pair of shoes with her allowance. She exchanged her opportunity of buying the shoes by buying the pair of jeans. This is the opportunity cost because the potential of losing the alternative (shoes) happened by purchasing the other.

Iwould think that the correct answer is 8.1

It should be a or d i’m not sure