Each of the three provided options is a complete sentence because they all contain a subject and a predicate, expressing a complete thought. Therefore, the correct answer is option D: All of the above are complete sentences. Complete sentences must have both a subject and a verb, conveying an entire idea.
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All three options presented in the question are complete sentences because each contains a subject and a predicate. Therefore, the correct answer is that all of the options are complete sentences. Sentences should express a complete thought. ;