Exhibit 6.3 -Refer to Exhibit 6.3,which Shows Ken's Demand Curve for Neckties.When

Exhibit 6.3

-Refer to Exhibit 6.3,which shows Ken's demand curve for neckties.When the price of neckties is $5,Ken purchases four neckties.When the price of neckties falls to $4,he purchases five neckties.A decline in the price of neckties causes his expenditure to _____

A) increase from $20 to $25, increasing his consumer surplus.
B) increase from $20 to $25, decreasing his consumer surplus.
C) remain constant at $20, leaving his consumer surplus unchanged.
D) remain constant at $20, increasing his consumer surplus.
E) decrease from $20 to $15, increasing his consumer surplus.