The correct answer is does
The answer is C. The first one is totally a fragment!
Alexander develop the idea that he has served his people well because He claims that his army and navy are the world’s strongest.
<h3>What is an excerpt?</h3>
An excerpt refer to words, statement , phrases or sentences which is extracted from a literature which has meaning.
Therefore, Alexander develop the idea that he has served his people well because He claims that his army and navy are the world’s strongest.
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It's got to be C because none of the others relate to collaboration, but I'd say if you were unsure about this answer then the only other sensible one could be B, but I'd go with C.