The Demand Function in a Duopoly Is: P = 100

The demand function in a duopoly is: P = 100 - 2(Q1 + Q2) ,where P = price,Q1 = output of the firm,and Q2 = output of the second firm.If the first firm decides to sell 10 units while the second firm sells 20 units,which of the following will be true?

A) The second firm will earn twice as much revenue as the first firm.
B) The second firm will sell at a lower price than the first firm.
C) An increase in one firm's output will not affect the other firm's revenue.
D) The first firm will earn a higher profit than the second firm.
E) The market price will be determined by the second firm's output which is larger than the first firm's output.