The Best Available Technology Emission Standard That Is Applied to Toxic

The best available technology emission standard that is applied to toxic or unconventional water pollutants requires that:

A) polluters must adopt better pollution-controlling technology as it becomes available
B) polluters must adopt better pollution-controlling technology within 10 years of its becoming available
C) polluters must adopt better pollution-controlling technology as it becomes available if they can do so without significant costs
D) polluters must adopt better pollution-controlling technology as it becomes available if they can do so without unreasonable costs
E) none of the other choices are correct