Identifying Parallel Structure Errors

Read the following sentences and identify which option contains a syntactical error with regard to the use of parallel structure. The ability to maintain parallelism in writing is essential for clarity and readability.

1. She enjoys reading novels, writing poetry, and to paint.

2. The team is responsible for gathering data, analyzing results, and preparing reports.

3. The presentation covered the historical context, significant events, and future implications.

4. He likes biking, hiking, and to swim.

5. They chose to travel by train, to see the countryside, and flying was preferable.