X has several outstanding debts, including: BDT 10,000 owing to B BDT 5,000 owing to C Y, X's father, offers to pay B the sum of BDT 2,500 on the understanding that B will not make any claims against X for the balance of the BDT 10,000 debt. B agrees, but later changes his mind and claims the balance of the debt owed by X. C agrees to accept a sweepstake ticket in the Melbourne Cup in settlement of the debt. Later C thinks that the ticket was not sufficient and wants repayment of half the BDT 5,000 debt in addition to the ticket.Would B and or C be successful?