One of the Characteristics of the Cap-And-Trade System Is That

One of the characteristics of the cap-and-trade system is that

A) there is no way to ensure that pollution is reduced below some allowable total amount.
B) it is inflexible, and does not respond well to differences in the marginal cost of pollution reduction.
C) it is more expensive than a command-and-control system.
D) it reduces the economic damage that would have been done by a command-and-control system.