Odysseus tells Polyphemus that his name<span> was No Man, or </span>Nobody<span>, to trick the cyclops.
I'd say he did that so the cyclops will not be able to get help from his friends.
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The answer is the last one, D. All of the other transitions indicate that the writer will either go into further detail on the subject or list other reasons as to why this would be correct. However, D clearly uses a contrasting transition to introduce a new argument.