Wood Pellets Are Produced from the Waste Sawdust of Lumber

Wood pellets are produced from the waste sawdust of lumber and paper mills.Home-heating stoves burning these pellets can heat homes directly,instead of relying on other energy sources.Heating your home with wood pellets is

A) sustainable,less polluting,and more efficient than heating a home using electricity from a coal-fired power plant.
B) sustainable,much more polluting,and is about 30% more efficient than using electricity from a coal-fired power plant.
C) not sustainable but is less polluting and is about as efficient as using electricity from a coal-fired power plant.
D) not sustainable and actually pollutes more than using electricity from a coal-fired power plant.