Which Client Statement Reflects an Understanding of the Effect of Circadian

Which client statement reflects an understanding of the effect of circadian rhythms on a person's ability to function?

A) "When I dream about my mother's horrible train accident,I become hysterical."
B) "I get really irritable during my menstrual cycle."
C) "I'm a morning person. I get my best work done in the a.m."
D) "Every February, I tend to experience periods of sadness."