Which of the following best explains the difference between a matched-subjects design and a repeated-measures design?

Group of answer choices

A. For a repeated-measures design the same participants are used in both treatment conditions. In the matched-subjects design, two different sets of participants are used.

B. For a repeated-measures design two different sets of participants are uses. In the matched-subjects design the same participants are used in both treatment conditions.

C. In a matched-subjects design each participant is matched with respect to a specific variable with a participant in the second condition so that the two separate samples are equivalent with respect to the matching variable. No such matching occurs in the repeated-measures design.

D. Both a and c.

Please only give the letter for the correct answer.