Assume that in a competitivemarket with a linear supply curve that the price of a good rises from 100 to 130 and that the quantity sold rises from 500 thousand to 700 thousand. Theamount of producer surplus gained by sellers of the additional 200 thousandunits is:

A. $3 million.

B. $4 million.

C. $10 million.

D. $12 million.