Why Did the Requirement That Tankers Purchase New Discharge Equipment

Multiple Choice

Why did the requirement that tankers purchase new discharge equipment reduce oil pollution?

A) The newly required equipment was cheaper than the old equipment,so more tanker companies purchased it.
B) The new equipment made it easier for transnational advocacy networks to monitor tankers at sea.
C) Although the new equipment was more expensive than the previous measures,verification of compliance was easier than before.
D) Many tanker companies could not afford the new equipment and went out of business; fewer tankers resulted in fewer oil discharges.