Which of the Following Is Not a Realistic Scenario Faced

Which of the following is not a realistic scenario faced by government regulators of a natural monopoly?

A) The monopolist may have an incentive to prevent the regulators from learning the true costs of production.
B) The monopolist may want to give the regulators information on the costs of production but may not have it to give.
C) The regulators may not care whether the monopolist gives them the true costs of production.
D) Any cost information that is given to the regulators may be outdated by the time the regulators act on it.
E) All of the above are realistic.