A) First Monday of October
B) October 01
C) First Sunday of October
D) October 03
Explanation: The World Habitat Day is observed every year on the First Monday of October throughout the world to reflect on the state of our towns and cities, and on the basic right of all to the adequate shelter as well as remind people that they are responsible for the habitat of future generations. In 2021, World Habitat Day is being celebrated on October 04.
