Paragraph 4 mentions all of the following information EXCEPT ______.
A. Disastrous landslides convert the deforested land into the form of steep mountain hillsides.
B. Landslides that destroy fields, homes, and human lives are due to the combination of steep slopes, high rainfall, and the lack of tree roots to bind the soil.
C. Soil in many humid forests becomes very poor in nutrients because the forests have been cleared, and are soon abandoned.
D. The nutrients contained in vegetation are burned and fly away, or are washed away by rain.