Which best describes the underlined words in the sentence? the astronomy students went on a field trip to the observatory a. complete subject b. compound subject c. simple subject

If the underlined words are the astronomy students, then this is a A. complete subject, given that those are all the words that make up the subject of this sentence.
It cannot be a simple subject, because it would have to have only one word, and it cannot be a compound subject, because it has more than one subject in it.

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