The answer is B, understand the plot.
The part of speech which relate to NCOs is noun. It is the main subject about which the sentence talks about.
Given the sentence:
The only NCOs who are authorized to carry a sword are Marine NCOS.
There are eight parts of speech in English grammar, which are:
- noun,
- pronoun,
- verb,
- adjective,
- adverb,
- preposition,
- conjunction, and
- interjection.
In the given sentence, NCOs is the noun and 'to carry' is the verb.
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Whenever you're examining supporting details and combining them with your own knowledge to create meaning, you are simply: Identifying the main idea. Hope that helps.