C has entered into one transaction as buyer (the acquisition of Plot 1 by C) in consideration of entering into another transaction as seller in another (the acquisition of Plot 2 by B).
Mae C wedi ymrwymo i un trafodiad fel prynwr (C yn caffael Plot 1) yn gydnabyddiaeth am ymrwymo i drafodiad arall fel gwerthwr mewn un arall (B yn caffael Plot 2).