A.A promises to paint a picture for B. B afterwards forbid him to do so

B.A owes B Rs. 5,000. C pays to B Rs. 1,000, which B accepts in satisfaction of his claim against A

C.A awaits arrival of B to finish the painting for B

D.A owes B Rs. 2,000 and is also indebted to other creditors. A makes an arrangement with his creditors, including B, to pay them, half of the loan amount. A pays to B Rs. 1,000