Pigeons Determine Compass Direction Using the Position of the Sun

Pigeons determine compass direction using the position of the sun with respect to their circadian clock.This phenomenon

A) represents an example of using landmarks to navigate.
B) is called a time-compensated solar compass.
C) illustrates the use of magnetic cues by pigeons.
D) also works with the circannual clock of pigeons.
E) is not disrupted by clock shifting experiments.