Answer:
B. It emphasizes ideas.
Step-by-step explanation:
Parallelism is a literary device in which a writer uses similar grammatical structures or patterns to create a sense of balance and repetition in a sentence or passage. This repetition can help to emphasize ideas and create a sense of rhythm or flow in the writing. By repeating similar structures or patterns, the writer can also create a sense of unity and coherence in the text, making it easier for the reader to follow and understand. Therefore, one effect that parallelism has on a written work is that it emphasizes ideas.