In the Contract of Sale of Jones' House to Greenwood

In the contract of sale of Jones' house to Greenwood, no particular method of payment was specified. Greenwood's lawyer has heard rumours that Jones got a much better offer after he signed the deal with Greenwood, and, from the attitude displayed by Jones recently, Greenwood's lawyer thinks Jones may be hoping the deal will fall through. Greenwood

A) should make sure he has a certified cheque for the full amount on the date of closing.
B) should make sure he has cash for the full amount on the date of closing.
C) should make sure that, if he has a personal cheque for the full amount, it is accompanied by a banker's letter guaranteeing the funds are there.
D) need not worry about how payment is made since, as long as it is the exact amount, Jones cannot legally refuse any mode of tender, provided that the contract did not stipulate a particular mode.