Maggie is trying to convince her friend Hannah to spend the morning at the beach instead of studying economics. Maggie's argument is that the beach is free so will not cost Hannah anything to go. Maggie even volunteers to drive. Maggie's argument ____. assumes Hannah has to eat at home or the beach so it will not cost Hannah additional money is forgetting Hannah's opportunity cost of not being able to study is correct; it is free to go to the beach is forgetting sunk costs