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The correct answer is option-2, Digboi. Digboi oil field is the oldest oil field in India and is still producing oil.
Option-1, Bombay High, is one of the largest oil fields in India and was discovered in 1974, but it is not the oldest oil field.
Option-3, Ankleshwar, is an important oil field in Gujarat that was discovered in 1958. While it has been a significant producer of oil, it is not the oldest.
Option-4, Naharkatiya, is an oil field in Assam that was discovered in 1953. It has been a major source of oil, but it is also not the oldest.
Digboi oil field, on the other hand, was discovered in 1889. It was the first commercially viable oil discovery in India and has been producing oil for over a century. It is known for its historical significance and contribution to the development of the Indian oil industry.