The revision which combines sentences 2 and 3 to add sentence variety is "King uses both techniques at the same time so that he can emphasize important ideas". Thus, the correct answer is C.
What is Sentence variety?
A technique used by writers to assist readers in determining which ideas are most significant, concepts that support or explain other ideas is known as sentence variety.
Writing can be given life and rhythm by changing the sentences. Readers will become bored if there are too many sentences with the same structure and length. Changing the style and structure of your sentences might help you avoid repetition and emphasize important points.
In sentence 3 of the option, the writer uses sentence variety by changing the structure of the sentence and helping readers to understand the clear meaning with minimum words.
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