The primary constriction at the lips.

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Multiple Choice

The primary constriction at the lips.

Explanation:
The place where the air is most restricted defines the sound’s articulation. If that primary constriction is at the lips, the sound is bilabial because both lips come together or nearly touch to create the closure or narrowing. Examples of bilabial sounds include p, b, and m, which are produced with the lips themselves forming the constriction. This differs from labiodental sounds, which involve the lower lip against the upper teeth; alveolar sounds, where the tongue tip or blade makes contact with the alveolar ridge; and palatal sounds, where the body of the tongue presses against the hard palate. Since the constriction is at the lips, bilabial is the correct label.

The place where the air is most restricted defines the sound’s articulation. If that primary constriction is at the lips, the sound is bilabial because both lips come together or nearly touch to create the closure or narrowing. Examples of bilabial sounds include p, b, and m, which are produced with the lips themselves forming the constriction. This differs from labiodental sounds, which involve the lower lip against the upper teeth; alveolar sounds, where the tongue tip or blade makes contact with the alveolar ridge; and palatal sounds, where the body of the tongue presses against the hard palate. Since the constriction is at the lips, bilabial is the correct label.

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