The correct answer is: World Wetlands Day.
World Wetlands Day is an international observance that is held on 2 February each year. It was designated by the United Nations Environment Programme (UNEP) in 1971 to raise awareness of the importance of wetlands and the need for their protection.
Wetlands are areas of land that are saturated with water, either permanently or seasonally. They include swamps, marshes, bogs, and fens. Wetlands play an important role in the environment by providing habitat for wildlife, filtering water, and storing carbon.
World Wetlands Day is celebrated through a variety of events and activities around the world. These events aim to educate people about the importance of wetlands and to encourage them to take action to protect them.
The other options are incorrect because:
- World Ocean Day is celebrated on 8 June.
- World Blood Donor Day is celebrated on 14 June.
- World Refugee Day is celebrated on 20 June.