Unreasonable exploitation of Amazon rainforest, such as slash and burn, deforestation and land reclamation by indigenous people; The construction of the Amazon Trans-highway, etc. , plundered the timber along the way, and the area of Amazon rainforest has been decreasing due to human factors, resulting in environmental problems such as soil erosion, increased sediment concentration in rivers, looting of precious wild animals, and reduction of biodiversity. Combination options.

So choose: C.