Choose the sentence elements that can be used as nouns.
adjective
infinitive
gerund
noun clause
participle
adverb

your answer is

A. Adjective

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Adjective : The poor  should be considered by the government. ( They should...)// The rich should pay higher taxes. The underlined words are functioning as nouns.

Infinitive: To smoke is dangerous. (It is dangerous.)

Gerund: Smoking is dangerous ( It is dangerous..) // I like reading books. (I like it.)

Noun clause: That he is a liar will be in the news. ( It will be...) // I do not think that he is married. ( I do not think so)

All the underlined elements can be subtituted for a pronoun or so : personal or impersnal. Look at the information in parentheses. So replaces a noun clause when the noun clause comes after a verb like "to think".

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the answer is b ik this because i ahd this in a quick quiz