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.

Please provide an explanation