Given here are four sentences. The first sentence is in correct order, while the rest of the sentences are jumbled. Pick the option that gives their correct order.
A. World Environment Day is celebrated on 5 June every year by the UN.
B. In 2019, more than 130 countries participated actively and supported it.
C. It is the UN's most impactful campaign for spreading awareness to conserve our environment.
D. Over the years this campaign has become the means for public participation.

Correct option is B

Let’s analyze the logical sequence step-by-step:
· Sentence A introduces the main idea: World Environment Day, its date, and association with the UN. So, it must come first.
· Sentence C adds more detail about what this day represents — a campaign to spread awareness. This logically follows A.
· Sentence D talks about the evolution of the campaign — that over the years it gained public participation. So, it follows C.
· Sentence B provides a specific instance (2019) to show the campaign’s reach — fits best at the end.
Thus, the logical flow becomes:
→ A (intro) → C (description) → D (evolution) → B (example)