Refer to the Description Below

Multiple Choice

refer to the description below:
Erica is running a study to investigate the effect of exercise on insomnia symptoms. She recruits participants who report having experienced insomnia at least once a week and assigns them to either exercise for 30 minutes every day or to read a book for 30 minutes every day.
-Erica's study uses a _______________________ design.

A) within-subjects
B) matched-groups
C) between-subjects
D) counterbalanced