Suppose the Market Supply for Good X Is Given by Q_X^S

Suppose the market supply for good X is given by Q_X^S = -100 + 5P_X. If the equilibrium price of X is $100 per unit then producers' revenue from X is

A) $100.
B) $20,000.
C) $40,000.
D) cannot be determined from the information contained in the question.