Janine wants to answer a question about how fertilizer affects the growth of her corn plants. She adds the fertilizer to half th
e plants in her cornfield. Which option describes the best data she can collect to help her draw a conclusion about the effect of the fertilizer on the corn? A. the weekly rainfall for a month
B. the height of each corn plant each day for a few weeks
C. the temperature each day for a few weeks
D. the cost of the new fertilizer compared to the old fertilizer