Task: Question Answering
Input (English): After fields of crops are harvested, parts of the plants remain on the ground. For many years, farmers have mixed these plant remains into the soil. Which most likely results from this practice?  
 (A) More minerals are lost from the field. (B) More nutrients in the soil are dissolved. (C) The organic matter in the soil increases. (D) The number of organisms in the soil decreases.
Output (English): C