Birds Have Been Placed on an Artificial Light-Dark Cycle in a Laboratory

Multiple Choice

Birds have been placed on an artificial light-dark cycle in a laboratory that initially corresponds to the natural lighting conditions outside; the lights are on from 6:00 a.m. to 6 p.m. The light period is then shifted so that the lights come on at 9:00 a.m. In this case, the animal's body time would be set

A) at natural time. Their biological clocks are not fooled by the artificial lighting.
B) 3 hours earlier than real time.
C) 3 hours later than real time.
D) 6 hours later than real time.