Chicks' Begging Calls Are Graded in Intensity

Chicks' begging calls are graded in intensity. This is a signal that appears to be

A) dishonest, because each chick will always benefit by out-begging its sibling, whether it is really hungry or not.
B) dishonest, because there is little cost associated with begging too much.
C) honest, because research has shown that the vigor of begging increases with hunger.
D) honest, because the parents can always detect a manipulative message by a chick.

Correct Answer:

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