By saying these figures are conservative (Line 1 paragraph 3) Dr. Worm means that ___

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By saying these figures are conservative (Line 1, paragraph 3), Dr. Worm means that ________.

[A] fishing technology has improved rapidly

[B] then catch-sizes are actually smaller then recorded

[C] the marine biomass has suffered a greater loss

[D] the data collected so far are out of date

请帮忙给出正确答案和分析,谢谢!

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