Chris Promises Doreen $40,000 If She Graduates from Eagle College

Essay

Chris promises Doreen $40,000 if she graduates from Eagle College.Doreen enrolls in Eagle,attends full-time for four years,and graduates.When Doreen asks Chris for $40,000,Chris says,"I don't remember promising you $40,000.But if there was a promise,it's not enforceable,because we didn't bargain for it.And even if there was a promise that would otherwise be enforceable,I revoke it now." Can Doreen enforce Chris's "promise" Why or why not