Final answer:
The sentence that uses parallel structure is option B: 'Maria developed the slide show, but Mark wrote the script.' This sentence employs parallelism by using the past tense consistently for both verbs, creating a balanced and symmetrical structure.
Step-by-step explanation:
Understanding Parallel Structure
Parallel structure, also known as parallelism, is an important grammatical and stylistic device in English writing. It involves using similar grammatical structures for elements of equal importance within a sentence or across multiple sentences. Parallel structure enhances readability and balance in writing.
Looking at the provided options, we can determine which sentence employs parallel structure:
The correct sentence that uses parallel structure is option B. In this option, both actions are described in the past tense, demonstrating balance and symmetry in the construction of the sentence.