Which would create a fast pace?

A. Formal diction

B. Lengthy sentence

C. Repeated sentence structure

D. Short sentences

I think it's D. Short sentences

D, short sentences. short sentences are often used to speed up the pace of prose because you read short sentences quickly. when you're in a panicked situation, you usually think in brief thoughts that overlap and cause a sense of chaos in your mind; short sentences in prose have a similar effect.