Which sentence demonstrates correct parallel structure?

• A. She enjoys hiking, to swim, and biking.
• B. She enjoys hike, swimming, and biking.
• C. She enjoys hiking, swimming, and biking.
• D. She enjoys hiking, swimming, and to bike.

Answer: (C)

Parallel structure means keeping the same grammatical form for items in a list after a verb like enjoy. After enjoy, English tends to take a gerund form (-ing) for each item. So the sentence with hiking, swimming, and biking uses the same -ing form for all items, giving a clean, balanced rhythm and making the meaning clear.

The other options break that balance: one mixes an infinitive with gerunds, another uses a base form that doesn’t match, and the last ends with an infinitive rather than the -ing form. Keeping all three items as gerunds—hiking, swimming, and biking—preserves the parallel structure.