John Owes Jill $2000

John owes Jill $2000.John informs Jill that he is unable to pay the debt.Jill agrees to accept $1500 and to waive the rest of the debt.Which of the following will not prevent Jill from enforcing payment of the balance of the debt?

A) At Jill's request John pays the equivalent of $1500 in US currency even though he originally agreed to repay the $2000 in Australian dollars.
B) At Jill's request John accompanies the payment of $1500 with the performance of a service.
C) John pays the $1000 earlier than the agreed date for repayment.
D) John's financial status worsens and he is evicted from his rental property.