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Answer:
D. Rocket
Explanation:
A direct object is a noun or a pronoun that receives the action in the sentence; they can be identified by answering the “what?” or the “who?” questions.
In the given question, <em>rocket</em> is the direct object because it receives the action <em>launch</em>. Furthermore, we can also identify it as the direct object when we ask the question "What did they launch?" Answer: (Some kind of) rocket.
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