Which One of the Following Statements About Overexploitation of Whales

Which one of the following statements about overexploitation of whales is false?

A) Commercial whaling has been suspended for the last 20 years.
B) Whale oil is now entirely replaceable with oils derived from petroleum.
C) Since the worldwide moratorium on all commercial killing of whales,most species have returned to pre-hunting levels.
D) The right whale was the first to decline due to commercial hunting.
E) Initially,the International Whaling Commission (IWC) was not very effectivE.