Task: Question Answering
Input (English): Two identical plants are planted 3 meters apart. One plant is flowering, but the other is not. A student concludes that the plants are receiving an unequal supply of water. Another possible explanation the other plant is not flowering is that the plants are  
 (A) too close to one another. (B) receiving different amounts of sunlight. (C) in soil with high humus content. (D) receiving different amounts of carbon dioxide.
Output (English): B