
Passage: Wildlife conservation organizations: if there is no trade, there will be no killing; without killing, man and nature can live in harmony.
Question: If the above statement is true, which of the following options must be true?
A. A.As long as there is killing, there must be trade.
B. B.As long as the trade is banned, man and nature will live in harmony.
C. C.Only when the trade is banned can man and nature live in harmony.
D. D.The reason why man and nature can not live in harmony is because of the existence of killing.
Answer: