A monopolist faces a market demand Q(p)=1500-5p and has cost function C(q)=120q. Suppose that the government intervenes the market and splits the monopolist into two firms with cost functions C1(91)=120q1 and C2(q2)=120q2. Let q1 denote the output of firm 1 and q2 denote the output of firm 2. If the newly created firms compete in Cournot model, then firm 1's reaction curve is given by _. O q1(92)=300 O q1(92)=450 O 91(92)=450-0.592 O q1(92)=450-0.591 O 91(92)=900-92