When was 'World Earth Day' observed?

Correct option is B

The correct answer is (b) April 22.
· World Earth Day is observed every year on April 22.
· It is an annual event celebrated globally to raise awareness about environmental protection and promote actions for the conservation of our planet.
· The first Earth Day was celebrated in 1970, marking the beginning of the modern environmental movement.
Additional Information:
· March 22 : Observed as World Water Day to highlight the importance of freshwater resources.
· February 22 and January 22 : These dates are not associated with Earth Day.