Which of the following studies uses a matched-subjects design? A)None of the other options is a matched-subjects design. 
 B)A sample of children is tested for vocabulary skills at age six and then again at age ten. 
 C)A group of twins is tested for visual acuity on one day and then tested again the following day after receiving a drug. 
 D)Participants are assigned to one of two treatment groups so that each participant in one group has very similar education as a participant in the other group.

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