What device is used to create rhythm or build up emotions in writing through the repetition of phrases or structures?

The choice of parallelism effectively points to the technique of using repeated grammatical structures or phrases to create a rhythmic flow or to emphasize particular ideas in writing. This repetition serves not only to enhance the aesthetic quality of the text but also to build intensity and emotional resonance with the reader. When phrases or structures are replicated in a similar manner, it allows the rhythm of the passage to become more pronounced, guiding the reader's emotional response and focusing their attention on specific concepts.

In contrast, while repetition also references the reiteration of words or phrases, it lacks the specific structural framework that parallelism provides. Imagery, on the other hand, pertains to the use of descriptive language to evoke sensory experiences rather than rhythm. Similarly, symbolism involves using symbols to convey deeper meanings, which differs from the goal of establishing rhythm or emotional buildup through structured repetition. Thus, parallelism stands out as the correct answer for techniques aimed explicitly at creating rhythm and emotional buildup in writing.