【单选题】If a study by medical researchers finds that eating brown rice causes weight loss while eating white rice causes weight gain, then we likely would see
A.
an increase in demand for brown rice and a decrease in demand for white rice.
B.
a decrease in demand for brown rice and an increase in demand for white rice.
C.
an increase in demand for both brown and white rice.
D.
no change in demand for either type of rice because weight loss is not a determinant of demand.