When Promoting Average Cost Pricing, Regulators

When promoting average cost pricing, regulators

A) include what they consider to be a normal rate of return on investment.
B) encourage firms to produce at the output level where price equals marginal cost.
C) fail to consider a return to investors, so regulated firms often have a hard time raising investment funds.
D) inflate costs so much that price ends up as large as would prevail under unregulated monopoly.