the questions are indicated on the picture

Instruction: Explain or state briefly the rule or reason for your answer. 1. D (debtor) borrowed P20,000 fromC (creditor) payable on or before August 30. Before the arrival of the due date, C agreed to the promise of B to pay Cif B wants. Can C insist that B pay not later than August 30? 2. Suppose in the same problem, D obliges himself to pay C P10,000 after C paid his obligation to T. Is the obligation valid? 3. S (seller) agreed to sell B (buyer) a specific car for P200,000, delivery of the car and the payment of the prie to be made on June 15. Supposes S delivered the car on June 15 but B failed to pay the price, what are the remedies of S? 4. D binds himself to give P10,000 to C upon the death of the father of D. Is the obligation of D conditional or one with a period? 5. D borrowed P10,000 from C at 15% interest per annum payable on December 31. Can D require C to accept payment before December 31? 6. S sold his TV set to B who gave S the option to deliver instead of his refrigerator. Is S liable to B in case the TV is lost through S's fault