Choose the option in which the underlined clause in each of the following sentences has been correctly identified:

It has been seen that virtue is its own reward.

Correct option is A

The underlined clause is “that virtue is its own reward,” which acts as the subject of the main verb “seen.”
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Information Booster

Noun clauses stand for a person, thing, or idea and commonly answer "what?" or "who?" after the verb.

Additional Knowledge

“Adjective” and “adverb” clauses do not act as subjects or objects; the principal clause provides the main idea, which is not the case here.