Task: Question Answering
Input (English): A group of students compared the effects of fertilizer on the growth of tomato plants. The students gave six tomato plants Fertilizer 1 and six other tomato plants Fertilizer 2. They grew the plants under the same conditions. After several weeks, the students concluded that the tomato plants that received Fertilizer 1 grew taller than those that received Fertilizer 2. Which of the following actions would have increased the accuracy of the results of this investigation?  
 (A) using different growing conditions for a group of the plants (B) growing a group of tomato plants without fertilizer (C) growing different types of plants with each fertilizer (D) applying a combination of fertilizers to all the plants
Output (English): B