Which of These Statements About Coal Is False

Which of these statements about coal is false?

A) Some types of coal contain a lot of sulfur.
B) Subsurface mining accounts for about 40% of the coal mined in the U.S.
C) Coal powered the steam engine during the Industrial Revolution.
D) Coal produces far less SO2 than natural gas or oil.
E) Coal supplies about 20% of the energy used in the United States.