Correct Answer:
C. World Environment Day
The correct answer is World Environment Day. Celebrated annually on June 5th, World Environment Day is the United Nations' principal vehicle for encouraging worldwide awareness and action for the protection of our environment. It was established by the United Nations General Assembly in 1972.
- Earth Day is observed on April 22nd.
- World Water Day is observed on March 22nd.
- International Biodiversity Day (or World Biodiversity Day) is observed on May 22nd.
Each of these important environmental days has a distinct date, making them incorrect options for June 5th.