If an Animal with a Circadian Clock of About 23

Multiple Choice

If an animal with a circadian clock of about 23.5 hours is kept in the dark without environmental time cues,it will

A) become active 30 minutes earlier each day.
B) become active at the same time each day.
C) become active 30 minutes later each day.
D) become active one hour earlier each day.
E) have an unpredictable pattern of activity.