The correct answer is: A. World Sleep Day
World Sleep Day is an annual awareness event held on the second Friday of March (22 February in 2023). It was initiated by the World Sleep Society in 2008 to highlight the importance of sleep and its disorders. The day is celebrated by organizing events and activities around the world to raise awareness about sleep and its disorders.
World Earth Day is an annual event celebrated on April 22 to demonstrate support for environmental protection. It was first celebrated in 1970 and is now one of the largest secular observances in the world, with more than 1 billion people participating each year.
World Book Day is an annual celebration of books and reading. It is celebrated on April 23, the date of the death of William Shakespeare and Miguel de Cervantes. The day is celebrated by organizing events and activities to promote reading and books.
Thinking Day is a day celebrated by the Scout Movement on February 22, the birthday of Lord Baden-Powell, the founder of Scouting. The day is celebrated by organizing events and activities to promote Scouting and its values.