The revision best uses dialogue to improve the sentence is: "“Honestly, I was surprised,” I told them truthfully. “The competition was ruthless, and I felt incompetent at the beginning. It’s really exciting to have my painting selected!” (Option B)
A dialogue is a sentence that is structured to depict that the conversation is between two or more people rather than a narrative by one person.
Hence, it is correct to indicate that The revision best uses dialogue to improve the sentence is (Option B) because this give better perspective to the event being narrated.
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