A veterinarian does research on the causes of enteroliths, stones that develop in the colon of horses. She suspects that feeding alfalfa might be a cause. To investigate that suspicion, she selects five horses that are known to have enteroliths and compares the number of flakes of alfalfa they have eaten over a month with the number of flakes eaten by five horses free of enteroliths. Based on the following data, a 95% confidence interval is given by: Enteroliths group: Healthy group: OA. (0.799, 33.201) OB. (-2.392, 36.392) OC. (-28.000, 45.000) OD. (-2.378, 25.689) n 755 8 9 45 12 ONS 28 10