Figure 4-7 -Refer to Figure 4-7.If the Demand Curve for Good X

Multiple Choice

Figure 4-7
-Refer to Figure 4-7.If the demand curve for Good X shifts from Db to Da,then

A) firms would be willing to supply more of Good X than before at each possible price.
B) people are willing to buy less of Good X than before at each possible price.
C) people's incomes must have increased.
D) the price of Good X has increased.