Annabel is weighing two opportunities, one is to work at the bank, while the other is to volunteer at a charity that means a lot to her. She decides to join the charity as a volunteer. What is meant by opportunity cost? Question 2Select one: a. The opportunity cost is the money she would have made working at the bank b. The opportunity cost is that the charity is a non-profit c. The opportunity cost is volunteering d. The opportunity cost is her time volunteering