Which Is Not a True Statement About Mining

Which is not a true statement about mining?

A) Surface Mining Control and Reclamation Act of 1977 requires mining companies to restore mined land for reuse
B) A tax is levied on mining operations to make it possible to reclaim land that was mine before the Surface Mining Control and Reclamation Act of 1977 was enacted
C) There are over 8000 unrestored coal mines in the United States
D) Waste rock can erode and leach toxic elements such as arsenic, sulfur, and heavy metals into the environment