A) Fourth Monday of September
B) 26 September
C) Fourth Sunday of September
D) 25 September
Explanation: World Rivers Day is celebrated every year on the “Fourth Sunday of September” since 2005, to raise global awareness of the need to support, protect and preserve the rivers around the world. In 2021, World Rivers Day is being celebrated on 26 September. The theme for World Rivers Day 2021 is “Waterways in our communities”.
