Answer:
c. Going to the mall if that is what you liked best.
Step-by-step explanation:
When evaluating the opportunity cost of any move or event we consider the alternate option that was not taken because the other opportunity was chosen ahead of it. Here, the action that was chosen was going to the movies and the opportunity cost of going to the movies would be what they liked or valued the most. Option c states that going to the mall if that is what you liked best and if they liked it best or most then it was most valued or preferred and therefore will be the opportunity cost of going to the movies.