World Environmental Day celebrated in

Answer: Option D

5^th June of every year is celebrated as World’s Environment Day.
This day was first observed in the year 1974 in the city of Spokane, USA. The first celebration, under the slogan, "Only one Earth" took place.
It is a platform to raise awareness of the problems faced by our environment like Air pollution, illegal wildlife trade, sustainable consumption, global warming, food security, etc.