Explanation
Correct answer: C.
Choice C is the best answer. The text describes the comfort rating scale: from −3 (very cold) to +3 (very hot), with 0 being neutral. Participant 20 gave a −2 comfort rating, a full three points colder on the scale than the other two participants.
Why the other choices are wrong
Choice A
Choice A is incorrect. This choice misreads the table. Participant 1 and participant 21 reported the same level of comfort, but participant 20’s comfort level was three points lower.
Choice B
Choice B is incorrect. This choice doesn’t use data from the table. The table only shows us one survey, so we don’t know if the participants’ ratings varied throughout the day.
Choice D
Choice D is incorrect. This choice misreads the table. Participant 1 and participant 21 reported the same level of comfort.