Answer Below as A Picture
Because he discovered them by mistake; he believed he had reached the East Indies
The opportunity cost that a person could have when they
decided to go to college after high school graduation is the opportunity to
have a good and full time job after graduation from college. Also a higher
salary will be possible upon graduating from college. Opportunity cost means the
benefit a person will received upon giving up another thing.
i think it is B, hope this helps