Explanation
The correct answer is (A) World Environment Day.
June 5th is celebrated globally as World Environment Day. It is an annual event established by the United Nations to raise awareness and promote action on environmental issues. World Environment Day serves as a platform for individuals, communities, and governments to come together and take positive steps towards sustainable practices, conservation of natural resources, and addressing environmental challenges. Various activities, campaigns, and events are organized worldwide to celebrate and highlight the importance of environmental protection on this day.