To produce some sounds, the flow of air out of the lungs is interrupted by the lips; for other sounds, the flow is disrupted by the placement of the tongue and teeth. This feature of sound production is referred to as

a. place of articulation.
b. manner of production.
c. voicing.
d. speech locus.

a. place of articulation.

Explanation:

The place of articulation are the location in the body where the there is a friction or blockage to the free flow of air usually in the larynx, mouth or lips. On the other hand, the manner of articulation is simply the way these articulators are placed to make effective speech possible without friction or blockages.

These places of articulation simply put are contact points where friction occurs between active articulators like the tongue and other articulators that are not directly involved like the mouth. This is necessary for effective sound production to take place. Production of consonant sounds is more common.

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