Under the Acid Rain Plan Adopted by Congress in 1977

Under the acid rain plan adopted by Congress in 1977, a new coal-burning power plant was required to install smokestack scrubbers

A) only if it was situated near a low-sulfur coal mine.
B) only if it was situated near a high-sulfur coal mine.
C) regardless of its proximity to a low-sulfur coal mine.
D) only if the level of its pollution exceeded federal limits.
E) if smaller smokestacks were not capped.