Among the options provided, juxtaposition is the narrative technique that does not primarily affect the pacing of a narrative.
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Dialogue can impact pacing by either speeding it up or slowing it down, depending on the content and structure of the conversation.
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Flashback can also slow down pacing, as it pulls the reader away from the current timeline to provide background information.
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Sentence length has a direct effect on pacing; shorter sentences tend to create a faster pace, while longer sentences can slow it down.
Juxtaposition, on the other hand, is a technique used to place two or more elements side by side for comparison or contrast, and while it can affect the thematic depth or highlight certain aspects of the narrative, it does not inherently control the pacing in the same way the other techniques do.