If You Were on a Submarine Deep in the Ocean

Multiple Choice

If you were on a submarine deep in the ocean with artificial light that was constant at all times,what would happen to your rhythm of wakefulness and sleepiness?​

A) You would feel wakeful and sleepy on an irregular, unpredictable schedule.
B) ​You would feel a constant state of low-alertness wakefulness.
C) ​You would continue feeling wakeful and sleepy on a nearly 24-hour basis.
D) ​You would feel sleepy after any physical exertion, and wakeful about 8 hours later.