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Why was Alex the parrot taught to "speak" rather than being taught a sign language or an artificial language?

A) ​Grey parrots lack the dexterity to use a computer touchscreen.
B) ​Researchers could not distinguish among the gestures made by parrots.
C) ​Grey parrots have vocal apparatuses that allow them to mimic many human sounds.
D) ​Alex refused to interact with the artificial language apparatus.

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My best thanks!