Artin is looking to test his theory that drinking caffeine before a math test has a positive effect on performance. His experimental group is administered 500 mL of caffeinated coffee 30 minutes prior to the test. Which of the following would act as the best control group?
A) Participants picked from the same population are told they will be tested on performance after drinking coffee and given 500 mL of caffeinated coffee 30 minutes prior to the test.
B) Participants picked from the same population are administered the test without any prior beverage.
C)Participants picked from the same population are given 500 mL of water 30 minutes prior to the test.
D) Participants picked from the same population are given 500 mL of decaffeinated coffee 30 minutes prior to the test.
Answer: D