An experiment was performed in which randomly selected diabetics took cinnamon extract daily while another randomly selected control group took none. After 40 days, the diabetics who had the cinnamon reduced their risk of heart disease while the control group experienced no change. What conclusions can you make based on this experiment? * A. The control group did not cooperate with the experiment.
B. The cinnamon extract was effective.
C. The experimental group had a lower risk of heart disease to begin with.
D. The cinnamon extract was not effective.