Final answer:
Syntax is the key element of style that authors utilize to vary sentence structures in their writing, enhancing the readability and engagement of the text.
Explanation:
Syntax is the element of style authors use when they vary sentence structures in a piece of writing. Varying sentence structures can add rhythm and flow to the writing, making it more engaging for the reader. For example, using a mix of long and short sentences can create a dynamic effect in the narrative.
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