What Data Allowed Jennifer Clarke (2010) to Conclude That Hens

What data allowed Jennifer Clarke (2010) to conclude that hens teach their chicks?

A) There was a strong relationship between the plants near which chick mothers produced food calls and the diet of their chick
B) Chicks performed food calls near the same plants they saw their mothers near
C) Chicks and their mothers produced food calls near the same plants
D) Chicks learned antipredator behaviors by observing their mother's reaction to predators
E) Chicks learned the location of food patches by observing their mother