mediumFPSCNTSCSSPPSCEnglish Grammar
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Correct Answer: C: by
Explanation: The correct answer is by. 'Often travels by air' uses 'by' as the preposition for modes of transport. 'By' is used with 'air,' 'sea,' 'land,' 'train,' 'car,' 'bus,' and 'plane' without an article.