Stackelberg coirlpetition: Firms choose their quantities sequentially. Both firms have the same cost function TC(q)= 3q. The market demand is Q(P)= 11-P. Both firms think mistakenly that they are the leader firm. What will be price in this case?
A. P= 7
B. P= 6
C. P= 5
D. P= 4
E. P= 3