All the following statements can be inferred from Paragraph Four EXCEPT that______.A．the s

All the following statements can be inferred from Paragraph Four EXCEPT that______.

A．the study method was different from the conventional ones

B．an outsider of a research can give an objective comment on the finding

C．land use patterns have a great impact on the quantity of birds

D．the present bird protection measures are not very effective

请帮忙给出正确答案和分析，谢谢！