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, if the biological clock is used to compensate for the movement of the sun, orientation in these subjects should be off by

A) 15º
B) 30º
C) 45º
D) 90º