Which of the Following Would Provide the Strongest Evidence That

Which of the following would provide the strongest evidence that pigeons use magnetic cues for orientation?

A) The detection and description of a neurophysiological magnetic transducer
B) Observations that orienting behavior takes place even on cloudy days
C) Evidence that the attachment of small magnets disrupts pigeons' homing behavior
D) Observations of pigeons gaining latitude information from magnetic fields
E) The discovery of magnetite particles in the cells of pigeons