Suppose That All Firms in a Given Industry Have the Same

Suppose that all firms in a given industry have the same supply curve given by S_i(p) = 2p when p is greater than or equal to $2 and S_i(p) = 0 when p is less than $2. Suppose that market demand is given by D(p) = 12 - p. If firms continue to enter the industry so long as they can do so profitably, the equilibrium price must be closest to

A) $5.
B) $4.
C) $2.40.
D) $2.
E) $1.75.