Abby received requests from three families to babysit a toddler for four hours on Friday night. She can only babysit for one of the three families. The Fleming family offered her $20, the Gilbert family offered her $30, and the Lewis family offered her $40. If Abby chooses to babysit for the Lewis family, her opportunity cost of this decision is: Please choose the correct answer from the following choices, and then select the submit answer button. Answer choices Incorrect: $40. $40. $30. $20. $50.