Task: Question Answering
Input (English): Leaves fall from deciduous trees onto the forest floor. These leaves decay slowly and become part of the topsoil. Which change is most likely to have a positive impact on the nutrients available in the topsoil?  
 (A) a decrease in temperature (B) a decrease in biodiversity (C) an increase in the number of predators (D) an increase in the number of decomposers
Output (English): D