Why do logged tropical rain forest soils typically have nutrient-poor soils?

A)Tropical bedrock contains little phosphorous.
B)Logging results in soil temperatures that are lethal to nitrogen-fixing bacteria.
C)Most of the nutrients in the ecosystem are removed in the harvested timber.
D)The cation exchange capacity of the soil is reversed as a result of logging.
E)Nutrients evaporate easily into the atmosphere in the post-logged forest.