They are both complete sentences. Hope I helped you
The best and most correct answer among the choices provided by the question is <span>D.direct object.
</span><span>.
</span><span>Wasn't that star Betty White?
</span>Betty White is direct object.
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i believe the best answer would be A
Lieutenant is not a part of the main clause, and it is an address to a person that is inserted into the sentence. It must be therefore separated by comas on both sides: the correct answer is a.