A.In 28 states, from West Virginia in the east to Montana in the west.
B.In 27 states, from West Virginia in the west to Montana in the east.
C.In 27 states, from West Virginia in the east to Montana in the west.
D.In 28 states, from West Virginia in the west to Montana in the east.


A.gas-fired power plants.
B.coal-fired power plants.
C.water generated power plants.
D.wind-generated power plants.
A.the U.S. Senate passed laws requiring federal mine inspections.
B.the U.S. Congress passed laws requiring federal mine inspections.
C.the U.S.health and safety officials passed laws requiring federal mine inspections.
D.the U.S. mine companies passed laws requiring federal mine inspections.
A.Russia.
B.India.
C.France.
D.China.