Maria spends her afternoon at the beach, paying $2 to rent a beach umbrella and $10 for food and drinks rather than spending an equal amount of money to go to a movie. The opportunity cost of going to the beach is.

A)zero, because she got food, drinks and an umbrella in return for the money.

B)the $12 she spent on the umbrella, food and drinks.

C)only $2 because she would have spent the money on food and drinks whether or not she went to the beach.

D)the movie she missed seeing plus the $12 she spent on the umbrella, food and drinks.

(And could you explain why please.)

Thank you