Use the Following Information to Answer the Question

Use the following information to answer the question. A researcher wonders whether receiving a job offer is effected by whether an interviewee wears a red tie. The researcher used the following study design to collect data: The researcher chose five large companies in a large city and observed the tie color of all interviewees during a two week period. He also records
whether the person was hired by the company. He finds that interviewees who wear red ties are more likely to be hired than interviewees who do not wear red ties.
-Which energy drink is better? In a study, researchers randomly assigned 50 similar adults to one of three groups. All subjects were allowed to sleep for eight hours followed by staying awake for ten
Hours. Depending on which group they were assigned to, subjects then drank 12 ounces of strong
Coffee, a name brand "5-hour" energy drink, or 16 oz of a name brand sports drink containing
Caffeine and vitamins. Afterwards, subjects were measured for mental fatigue. Researchers found
That the adults that drank strong coffee after being awake for ten hours were less fatigued than
Either those who drank the "5-hour" energy drink or the sports drink. For this controlled
Experiment, identify the treatment and the response variables.

A) Treatment: Strong coffee, 5-hour energy drink, and sports drink. Response: Change in mental fatigue.
B) Treatment: Strong coffee only. Response: Change in mental fatigue.
C) Treatment: Change in mental fatigue. Response: Strong coffee, 5-hour energy drink, and sports drink.