A scientist designs an experiment to determine the effects of pocket gopher herbivory on soybean crops. The scientist designs a treatment consisting of 200 soybean plants grown inside a cage in an agricultural field. A pocket gopher is introduced into the cage for three days. Which of the following designs would provide the best control for this treatment? a. 200 soybean plants grown inside another cage in the same agricultural field without a pocket gopher introduced.
b. 200 soybean plants grown in the same agricultural field.
c. 200 soybean plants grown inside a cage in a greenhouse without a pocket gopher introduced.
d. 200 corn plants grown in the same agricultural field.