The blank requires a past participle at its place; the auxiliary verb 'was' requires a past/present participle after it and the use of 'after' indicates past tense. The sentence talks of the flight making an emergency landing and the need for medical treatment by a Thai national. Also, the sentence mentions that the flight was bound to go to Bangkok, but it landed in Kolkata instead. Thus, the word 'diverted' fits correctly in the blank as its use conveys this diversion in the route correctly. Hence, option (c) is the correct answer.
Neither the word 'redirect' nor the word 'reroutes' is a past participle. Hence, options (a) & (d) are eliminated. The word 'aversion' (a strong dislike or disinclination) is a noun, while the word 'transferable' is an adjective, but the blank requires a verb. Hence, options (b) & (e) are eliminated.
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