"Since the Wind and the Flowing Rivers Can Take Away

"Since the wind and the flowing rivers can take away industrial waste without charge, polluting is a profitable activity even when people are seriously harmed downwind or downstream, unless environmental regulators stop it." This statement is

A) false if the property rights of downwind or downstream individuals are protected.
B) true if the property rights of industrialists are enforced.
C) never true.
D) always true.