Need explanation and answer please.

26) A number of perfectly competitive stores offer film developing as a service to their customers. Suppose that each store offering this service has a cost function C(q)=98+2q+2q and a marginal cost MC(q)=2+4q. The long run market demand for developing a roll of film is given by QD (P) = 9,194 - 40P. Compute the total number of firms that will produce in the long run equilibrium. A) 867 B) 1,386 C) 1,142 D) 1,245 E) 956