Suppose You Have an Hour Before Your Next Class Starts

Suppose you have an hour before your next class starts.From your most preferred alternative to the least, you can either read a book, get something to eat, or take a nap.The opportunity cost of getting something to eat is

A) the cost of what you eat
B) the value of an hour's worth of reading your book
C) the loss of value from not reading or sleeping
D) the net benefit of sleeping for another hour
E) impossible to determine because the most preferred alternative is not known