If Steven's Income Decreases And,as a Result,he Chooses to Buy

If Steven's income decreases and,as a result,he chooses to buy fewer bagels per month at each price,then his demand curve will

A) shift to the right.
B) shift to the left.
C) not shift;instead,Steven will move along his demand curve downward and to the right.
D) not shift;instead,Steven will move along his demand curve upward and to the left.