The BEST definition for mouthing behavior would be any instance of LukE.

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The BEST definition for mouthing behavior would be any instance of LukE.
A .  placing his mouth on any object for at least 5 seconds.
B .  placing his open mouth on a non-nutritive object or placing a non-nutritive object in his mouth.
C .  making contact with his mouth to any non-nutritive object.
D .  mouthing a non-nutritive item for 3 or more consecutive instances within a 30 second interval.

Answer: B

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