The domestic demand (Opp) for wheat in the United States is estimated to be ODD = 1430 -55P, where the quantity of wheat is measured in millions of bushels per year. Suppose China also demands U.S. wheat (Qpc) and that its demand is given by QDC = 2560 - 80P. What is the total demand for U.S. wheat, assuming the only two sources of demand are domestic and Chinese? The total demand for U.S. wheat is O A. QD =3990 - 135P for P = $32 and Qp = 1430 - 55P for P > $32. O B. QD =3990 - 135P for P = $26 and Qp = 2560 - 80P for P > $26. O C. QD = 2560 - 80P for all P. O D. QD =3990 - 135P for all P. O E. QD =3990 - 135P for P = $26 and Op = 1430 - 55P for P > $26