Plant growth is dependent on the amount of fertilizer applied. That was the hypothesis Mel and Bill decided on for their science project. They planted identical seeds in the same potting mix, in similar pots. Each pot received the same amount of water and all the pots were placed in the same location in the greenhouse. Mel and Bill’s data was summarized after three weeks. What would be an appropriate research question to guide this scientific investigation? A) Where do plants grow best? B) What influences plant growth? C) Does varying the amount of fertilizer influence plant growth? D) How does location and fertilizer amounts influence plant growth?