”Holding all other relevant factors constant, consumers will purchase more of a good as the price falls.” This statement reflects the behavior underlying:

”Holding all other relevant factors constant, consumers will purchase more of a good as the price falls.” This statement reflects the behavior underlying:
A.the supply curve.
B.a decrease in the demand curve.
C.an increase in demand.
D.the demand curve.
正确答案：the demand curve.