D Question 2 2 pts Mary's friends had asked her to join them at the beach, and her mum had asked whether she wanted to go shopping together that afternoon. Mary considered both attractive offers but ended up declining either of them. She instead has been studying all afternoon. Among these options, she would rather have spent time on the beach with her friends than going shopping with her mum. Which statement is true? The opportunity cost of studying that afternoon is spending time with her friends on the beach and shopping with her mum. O None of the above The opportunity cost of studying is shopping with her mum. The opportunity cost of studying is going to the beach with friends minus the benefit from going shopping with her mum The opportunity cost of studying is spending the afternoon on the beach with her friends