If One Firm in a Duopoly Increases Its Production by One

If one firm in a duopoly increases its production by one unit beyond the monopoly output,that firm's profit ________,the other firm's profit ________,and the total profit of the duopoly ________.

A) increases; increases; increases
B) does not change; does not change; does not change
C) increases; decreases; does not change
D) increases; does not change; increases
E) increases; decreases; decreases