What is the main reason that there has been more success teaching nonhuman primates to use sign language than spoken language?
A) Hand signals are easier than vocalizations.
B) Vocalizations are better controlled in humans.
C) Control of manual gestures is better in nonhuman primates.
D) All of the above.

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The Answer of What is the main reason that there has been more success teaching nonhuman primates to use sign language than spoken language?
A) Hand signals are easier than vocalizations.
B) Vocalizations are better controlled in humans.
C) Control of manual gestures is better in nonhuman primates.
D) All of the above.

What Is the Main Reason That There Has Been More