Ms. Brown's class designed an experiment to test the effectiveness of a well-advertised hand sanitizer. They compared the hand sanitizer with two brands of soap and water. As a control, the students rubbed their hands together for two minutes in warm water and then dried them with a towel. Their results are shown in the data table. When analyzing and interpreting the data which hand washing method is LEAST effective in killing bacteria? Question 4 options: soap A soap B warm water hand sanitizer