Task: Question Answering
Input (English): On the edge of many deserts, there is a delicate area with abundant vegetation. Sometimes cattle are allowed to graze in these areas. The hooves of the cattle compact the topsoil making it less absorbent. Which environmental concern is most likely to happen at the edge of the desert when cattle graze there?  
 (A) erosion (B) nutrient depletion (C) atmospheric heating (D) groundwater contamination
Output (English): A