Which of the following statements is NOT supported...

Câu hỏi: Which of the following statements is NOT supported in the passage? 

A The oceans in the past were more contaminated than they are now.

B Industrial wastes and agricultural run-off are blamed for the degradation of the oceans.

C Many pollutants deposited in the oceans finally become part of the global food chain.

D It is apparent that the oceans have been polluted for a long time.