Which of the following statements accurately reflect the role and equilibrium of monopoly power as regulated by government actions? 

A) Government imposition of a price ceiling above the monopoly price can lead to increased consumer surplus and potentially decrease deadweight loss.

B) The government can enhance social welfare by requiring monopolies to produce at a level where marginal cost equals marginal benefit, thus achieving allocative efficiency.

C) Patents granted by the government restrict monopoly power by encouraging competition and reducing the ability of a single firm to control a market.

D) By instituting a per-unit tax on the monopolist's output, the government inadvertently increases the monopolist’s incentive to produce more, decreasing prices to competitive levels.