The point is third-person omniscient subjective.
You can tell because the passage states the thoughts/feelings of multiple characters, while not using "I" or "You" or any other first or second person pronouns.
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behavior, language, customs and values
The answer is D. When you are saying what a broader subject is, you surround it with commas. For example, when I say "My aunt, Sally, is old.". My broader subject is aunt. I show more detail by telling you her name, Sally. I hope this helps!
The third statement is true.