The correct answer is 2 -> because cattle are maintained for their dung -> which is used as fertilizer and soil conditioner. This is mentioned in the passage as a reason why farmers maintain cattle -> in certain parts of the country. The other options are not mentioned in the passage as reasons for maintaining cattle.
Option 1 is incorrect because it mentions milk production -> which is not the reason mentioned in the passage.
Option 3 is incorrect because it mentions insect repellents -> which is not related to the passage.
Option 4 is incorrect because it mentions traditional ethics and values -> which is not the reason mentioned in the passage.