Parker Inc Promised to Pay $100 000 Cash to Coltrane

Parker Inc promised to pay $100 000 cash to Coltrane Ltd in exchange for a shipment of widgets.The widgets were delivered on October 1st and the price was to be paid on October 15.On October 13,Parker informed Coltrane that it would not be able to afford to pay any more than $75 000.Which of the following statements is TRUE?

A) Coltrane will be able to recover the full contract price even if it promises under seal to accept $75 000 in complete satisfaction of Parker's debt.
B) Coltrane will not be able to recover the full contract price if it agrees to accept $75 000 from Parker to be paid on October 14 in complete satisfaction of the $100 000 debt,that was to be paid on October 15.
C) If the parties are located in Alberta,Ontario,British Columbia,Manitoba,the Northwest Territories,Nunavut,Saskatchewan,or the Yukon,Coltrane will be able to recover the full contract price even if it has accepted Parker's offer to pay $75 000 in complete satisfaction of the $100 000 debt.
D) Coltrane will be able to recover the full contract price even if it accepts Parker's offer to satisfy the $100 000 debt by both paying $75 000 in cash and delivering a used truck to Rollins Corp,which is another company with which Coltrane has close ties.
E) There is no mutuality of consideration,and therefore the contract is invalid,because Coltrane actually delivered the widgets before Parker was required to pay the purchase price.