Saturday Afternoon You Can Either Attend a Street Festival,work and Earn

Saturday afternoon you can either attend a street festival,work and earn $100,or study for your midterm exam.You flip a coin between the street festival and studying,but did not really consider working.The coin flip determined that you would stay home and study.The opportunity cost of the time spent studying includes:

A) the loss of $100 worth of wages and going to the street festival.
B) earning a high score on your midterm.
C) the benefit that could have been received at the street festival.
D) The time you spent deciding upon using a coin flip to determine your Saturday afternoon activity.