Which of the following exampWhich of the following best exemplifies the concept of opportunity cost? A.) The high cost of gasoline B.) Your sister surprises you by giving you the shoes you like. C.) Everything is so costly that you take out a loan to cover expenses. D.) The lost wages from skipping work to go to the beachles is something economists study? A.) What the new form to track attendance at your school should look like. B.) Whether the president's political advisors should remain the same for the next term. C.) What factors affect gasoline prices over time. D.) What the ingredients are for a particular brand of pizza