Which of the following is correct? Can you please explain why this is (and why the other options are incorrect).

Which of the following statements is correct? Select one: a. Money allows purchasing power to be transferred between consumers. O b. I can exchange my apples for your oranges. Therefore apples can be classified as money. O C. Banks must exist for money to do its work. O d. In economics, money solely refers to the coins and notes in circulation