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The question is asking for the correct sequence of landing at listed airports during a flight from Delhi to Tokyo. This requires a knowledge of the geographical location of all these cities.
Option 1: Hong Kong, Hanoi, Taipei, Bangkok. This sequence is incorrect as it does not make a logical route from Delhi to Tokyo.
Option 2: Bangkok, Hanoi, Hong Kong, Taipei. This is the correct sequence. Flight would first land in Bangkok which is South-East of Delhi. Then it would proceed to Hanoi which is east of Bangkok. After that, it would reach Hong Kong, further east and north of Hanoi, and finally, the plane would head north-east to Taipei before reaching final destination Tokyo.
Option 3: Taipei, Bangkok, Hong Kong, Hanoi. This is not a logical sequence as it would involve back and forth movement.
Option 4: Bangkok, Hong Kong, Hanoi, Taipei. Similar to Option 1, this also does not make a logical route from Delhi to Tokyo.
Hence, the correct answer is Option 2.