A researcher conducted an experiment to study the effects of an herbal supplement on the duration of the common cold. From a sample of 50 people who had a cold, the researcher assigned 25 people to take the supplement each day. The other 25 people were asked to drink water each day and were not given the supplement. The researcher recorded the number of days the cold lasted for each person. What are the experimental units of the study? A. All people with a cold
B. The 25 people who were given the herbal supplement
C. The sample of 50 people who had a cold
D. The 25 people who were asked to drink water and were not given the supplement
E. The recorded number of days that the cold lasted for each person