With whom were the jails and courts overloaded

A．The initial cost is very low.
B．The fuel costs are cheaper.
C．Wood fires are more efficient, cleaner, and safer than ever before.
D．The wood-burning stoves are more efficient than gas or oil ones.

A．many Americans have switched from hydrocarbon-based fuels to wood because the price of the latter has risen.
B．some wood-burning stoves cost up to one hundred times more than others.
C．catalytic combustors increase the amount of pollution caused by wood burning stoves.
D．agitators are cheaper addition to wood-burning stoves than catalytic combustors.