From the passage it can be inferred that （）．A．hum

From the passage it can be inferred that （）．

A．human activities will do grave damage to rainforests

B．Amazon rainforest soils used to be the richest in the world

C．farming is responsible for the destruction of the Amazon rainforests

D．there once existed an urban civilization in the Amazon rainforests

请帮忙给出正确答案和分析，谢谢！