Select the sentence in which 'better' is an adverb. (49th Special BCS)

The word "better" is versatile in English — it can function as an adjective, adverb, or verb depending on context. Analyzing each option: Option (A): "hoping for better weather" — "better" modifies the noun "weather" — Noun modifier = Adjective ✗ Option (B): "Sound travels better in water" — "better" modifies the verb "travels" — Verb modifier = ADVERB ✓ — It answers the question: "How does sound travel?" → "better" Option (C): "decide which one is better" — "better" is a predicate adjective (subject complement after "is") — Adjective ✗ Option (D): "to better his health" — "better" functions as a VERB meaning "to improve" — It is an infinitive verb here ✗ Summary of "better" as different parts of speech: — Adjective: better weather, a better idea — Adverb: runs better, sleeps better, travels better — Verb: to better oneself, to better one's position — Noun: for the better, the better of the two Source: Longman Dictionary of Contemporary English; Oxford Advanced Learner's Dictionary.