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.
-What is the dependent variable in her study?

A) Exercise condition
B) Participants with insomnia
C) Insomnia symptoms
D) Time taken to exercise or read a book