Concerning Governmental Regulation of Pollution, Command-And-Control Regulations Suffer from All

Concerning governmental regulation of pollution, command-and-control regulations suffer from all of the following problems except

A) assigning the proper excise tax to discourage pollution
B) being subject to enforcement procedures that are costly for the taxpayer
C) regulators not having detailed knowledge of production facilities and processes
D) regulators not being aware of alternative methods of pollution abatement