Alex оwns а vintаge rоаd bicycle. On Mоnday, Alex and Bailey have a phone conversation in which they agree that Alex will sell the bicycle to Bailey for $800. Bailey promises to pay Alex the $800 the following Monday, and Alex promises to deliver the bicycle to Bailey at that time. Both agree that the price is fair. On Thursday, before either payment or delivery has occurred, Alex tells Bailey that Alex has changed their mind and will not sell the bicycle after all. Which of the following is the best answer?