Answer:
The main reason was the revolt of his army. Fearing the prospect of facing other large armies and exhausted by years of campaigning, Alexander's army mutinied at the Hyphasis River (Beas), refusing to march farther east.
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Explanation:
A, jumped overboard
other options are took over the ship by attacking captain, and not eating. But the only option of these is jumped overboard, which is A.