A) there were no steps taken in the past / अतीत में कोई कदम नहीं उठाया गया
B) the steps taken in the past were very good / अतीत में लिए गये कदम बहुत अच्छे थे
C) the challenge due to , emission is very serious today / आज उत्सर्जन के कारण चुनौती बहुत गंभीर हो गई है
D) there was no challenge due to emission in the past / अतीत में उत्सर्जन के कारण कोई चुनौती नहीं थी
Correct Answer: C
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