Ms. James wanted to buy a product that would kill bacteria on her students' hands before taking them to lunch. The label on the
hand sanitizer said that it would kill bacteria better than any soap on the market. Ms. James decided to compare the hand sanitizer to two brands of soap and plain warm water. Ms. James applied different treatments to four samples and counted the number of bacterial cultures after three days. The results are in the data table. What should Ms. James infer about the hand cleaning products? A) Both soap products were more effective than the hand sanitizer. B) Soap is not necessary to kill bacteria. You should just use water. C) Although hand sanitizer worked best, Soap A was almost as effective. D) Hand sanitizer worked the best and warm water was more effective than either soap.
