Vince Prefers to Take Classes Later in the Day and Feels

Multiple Choice

Vince prefers to take classes later in the day and feels he is most productive in the afternoon and evening.His friend Francesca prefers to go to bed early and get up early,and she claims to feel more productive in the morning.Vince's and Francesca's preferences may be regulated by biological cycles called

A) circadian rhythms.
B) narcolepsy.
C) activation synthesis.
D) automatic processing.