The answer is 5: a thesis
The <em>repetition of a specific theme dominanting</em> of things that have a significance in a literary work is what this literay device, motif, is about. It helps to develop the central theme. And, being a <em>recorring </em>element, it can be used as a <em>reminder of certain ideas</em> for the readers; <em>it's like the claim or main argument about a topic.</em>
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