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यहाँ चार वाक्य दिए गए हैं। पहला वाक्य (A) सही स्थान पर है, जबकि शेष वाक्य (B, C, D) क्रमहीन हैं। वह विकल्प चुनिए जो उनका सही तार्किक क्रम दर्शाता है। 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.