Why did Wilson regard the depletion of rain forest areas as the greatest extinction since

Why did Wilson regard the depletion of rain forest areas as the greatest extinction since the end of the age of dinosaurs？

A．The rain forests" survival is questionable.

B．It will become warmer and warmer with the depletion of rain forests.

C．Many wild animals will become extinct as a result of the depletion of rain forests.

D．The writer did not give his explanation.

请帮忙给出正确答案和分析，谢谢！