Which of the Following Differentiates a Matched-Subjects Design from a Within-Subjects

Which of the following differentiates a matched-subjects design from a within-subjects design?

A) The matched-subjects design uses only one group of participants.
B) The matched-subjects design removes individual differences from the variance.
C) The matched-subjects design reduces the likelihood that individual differences can become a confounding variable.
D) The matched-subjects design uses a different group of participants for each treatment condition.