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Correlative pairs (e.g., not only…but also, either…or, both…and) require parallel grammatical forms on both sides. Option C keeps parallel infinitive phrases: “to reduce … to improve,” correctly framed by the complete correlative construction. A and D mix an infinitive with a gerund (“improving”), breaking parallelism and weakening clarity. B reverses the mismatch (gerund vs. infinitive). On TEAS, underline the words after each half of the correlative; if endings differ (“-ing” vs. “to + verb”), revise to match. Also, keep the correlative complete; don’t drop “also” unless both halves remain balanced. Parallel structure enhances readability and precision—crucial in policies, care plans, and research aims. If you prefer not to repeat “to,” you can still be parallel: “The policy aims to reduce wait times and improve patient satisfaction.” The key is consistency in form, not repetition per se. Detecting and fixing nonparallel series is a frequent editing task on TEAS English.