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Directions: Read the passage given below and answer the following questions. Soil erosion happens when the soil is blown away by the wind or washed away by the rain. Soil erosion can be reduced by building terraces on hillsides, irrigation schemes to overcome droughts, planting more trees to bind the soil together, and using fertilizers in overpopulated areas to make the soil more fertile. It is very important that the farming techniques used do not damage the structure of the soil, as this erodes the soil. Good farming techniques include contour ploughing, crop rotation and keeping the soil rich in humus. Soil erosion happens, when the soil is ____.

A) watered

B) given fertilizers

C) blown away by the wind or washed away by the rain

D) treated with pesticides