World Literacy Day is celebrated on

May, 10
September, 8
June, 5
July, 15

The correct answer is (b). World Literacy Day is celebrated on September 8 every year. It was proclaimed by UNESCO in 1966 to promote literacy as a fundamental human right and essential for economic and social development.

The other options are incorrect. May 10 is International Workers’ Day, June 5 is World Environment Day, and July 15 is Nelson Mandela International Day.