Samia Has Decided That with the Two Hours in Between

Multiple Choice

Samia has decided that with the two hours in between classes she can do one of 3 things. She has ranked her choices, from highest to lowest as, (1) chat with her friends, (2) study economics or (3) take a nap. The opportunity cost of chatting with her friends is

A) the combined value of studying economics and taking a nap.
B) the value of studying economics, the next best use of time.
C) the value of chatting with her friends.
D) zero since she does not pay her friends to talk to her.