In order to maximize a market's consumer surplus and producer surplus

a) output should be reduced if marginal benefit exceeds marginal cost

b) output should be expanded if marginal cost exceeds marginal benefit

c) the market may need to move away from its competitive equilibrium

d) the different between marginal benefit and marginal cost should be maximized at the last unit produced

e) marginal benefit and marginal cost should be equal at the last unit produced