Jack and Jill Are Friends

Jack and Jill are friends. Jack agrees to do mow Jill's lawn and Jill agrees to pay $50.00. Jill wants the lawn mowed by April 1, 2002. Jill returns on April 3, 2002 and finds that the lawn has not been mowed. Jill, who is entertaining the next day, goes to Jack and promises that if he mows the lawn that day, she will give him an additional $20.00. Jack mows the lawn but Jill refuses to pay him the additional $20.00. Which of the following is true?

A) Jill has an obligation to pay the additional $20.00 because a legally enforceable promise to pay was made.
B) There was no offer and acceptance.
C) Jill have no obligation to pay because the promise to pay the additional $20.00 was not supported by fresh consideration. Jack had a pre- existing legal duty to mow the lawn.
D) Jill made an offer and Jack accepted it so a contract was created.
E) Jack can sue Jill for breach of contract.