Which of These Is Not a Method Used by Utilities

Multiple Choice

Which of these is not a method used by utilities to reduce sulfur dioxide emissions?

A) Burning low-sulfur coal
B) Crushing and washing coal to remove sulfur
C) Burning coal at high temperatures to break down sulfur
D) Employing flue gas scrubbers in smokestacks, which traps sulfur dioxide
E) Encouraging and implementing conservation and efficiency programs for customers