Refer to the Accompanying Table,which Represents the Costs and Production

Multiple Choice

Refer to the accompanying table,which represents the costs and production for a monopolist,to answer the following questions.

-When a monopolist lowers a price from $80 to $70,the quantity that the firm is able to sell increases from 100 to 150.The change in revenue associated with the price effect is equal to

A) $3,500.
B) -$3,500.
C) $1,000.
D) -$1,000.
E) $4,000.