Which option is an example of an experiment?
O A. Finding the number of red jellybeans in an average jar of
jellybeans by counting
B. Having customers fill out a questionnaire about their favorite
brand of toothpaste
C. Counting the number of times a number cube rolls a 5 out of 30
tries
D. Testing the effectiveness of a mouthwash by allowing one group
to use it and comparing the results with those of a group that
doesn't use it