When firms price discriminates, they: a. lose surplus from consumers who would have bought at the profit- maximizing uniform price. b. sell to new consumers that would not have bought at the profit-maximizing uniform price. c. sell to new consumers who would not have bought at the profit-maximizing uniform price but lose sales to existing consumers because of the higher prices. d. sell to new consumers who would not have bought at the profit-maximizing uniform price but lose sales to existing consumers because of the lower prices.