using different growing conditions for a group of the plants growing a group of tomato plants without fertilizer growing different types of plants with each fertilizer applying a combination of fertilizers to all the plants
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: 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?
Possibilities:
- using different growing conditions for a group of the plants
- growing a group of tomato plants without fertilizer
- growing different types of plants with each fertilizer
- applying a combination of fertilizers to all the plants

growing a group of tomato plants without fertilizer