Answer: 1
Explanation:
The "OH" sound from the o's in the sentence
C is the obvious answer because a involves talking and b shows the same thing. D shows how people use different words which is talking. Gestures and facial expressions use hand and face, not your voice.
The class system in the United States is an example of an open system. ... Mobility either upwards or downwards is more common in a class system, while in a caste system, people of different castes are traditionally in a more fixed social position throughout life, regardless of their individual abilities.