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The correct answer is option 1: 1 only.
Explanation:
Option 1 states that according to the regulations, limits have been set on Sulphur oxide and Nitrogen oxide emissions from ship exhausts. This statement is correct. The international regulations for the prevention of air pollution from ships, known as MARPOL Annex VI, do indeed set limits on the emissions of Sulphur oxide (SOx) and Nitrogen oxide (NOx) from ship exhausts.
Option 2 states that India is the first country to ratify the Convention for the Prevention of Pollution from Ships (MARPOL) of the International Maritime Organisation (IMO). This statement is incorrect. While India has ratified MARPOL Annex VI, it is not the first country to do so. The Convention has been ratified by many countries worldwide.
In summary, option 1 is correct as limits have been set on Sulphur oxide and Nitrogen oxide emissions from ship exhausts. Option 2 is incorrect as India is not the first country to ratify the Convention for the Prevention of Pollution from Ships.