Which Statement About Circadian Rhythms Is False

Which statement about circadian rhythms is false?

A) Animals kept in constant darkness at the same temperature continue to show daily sleep cycles.
B) In mammals, the suprachiasmatic nuclei (SCN) are the master circadian clock.
C) Daily rhythms are entrained to the environmental cycle of light and dark.
D) Free-running describes the circadian period length in constant conditions.
E) When long-day adult hamsters made arrhythmic by destruction of their suprachiasmatic nuclei (SCN) subsequently received SCN tissue from short-day fetuses, their circadian rhythms were restored, and the restored rhythms had long-day lengths.