Which of the following is known as "World Wetlands Day"?

1. A

   10 January

   (a) 10 January. This option claims that World Wetlands Day falls on 10 January, which is incorrect as this date has no global environmental observance of this scale. Therefore, this choice is not the key.

2. B

   15 January

   (b) 15 January. This option claims that World Wetlands Day is observed on 15 January, which is actually celebrated as Army Day in India. Hence, this choice is not the key.

3. C

   1 February

   (c) 1 February. This option claims that World Wetlands Day takes place on 1 February, coming just a day before the actual global observance. Thus, this choice is not the key.

4. D

   2 February

   (d) 2 February. This option claims that World Wetlands Day is celebrated on 2 February, marking the date of the adoption of the Ramsar Convention on Wetlands in 1971 in the Iranian city of Ramsar. This accurate historical and environmental alignment makes it the correct and intended key.

Summary. Official key is (d) 2 February. The question asks for the date recognized globally as World Wetlands Day. Options (a), (b), and (c) suggest incorrect dates associated with other observances or arbitrary days. Option (d) correctly identifies 2 February, commemorating the signing of the Ramsar Convention in 1971. This international treaty provides the framework for national action and international cooperation for the conservation of wetlands. Therefore, (d) is the right answer.