The sentence given below has been divided into five parts out of which the first part has been marked bold. There are five options which give the sequence of the rearranged parts. You must choose the option which gives the correct sequence of the parts. If the sentence requires no rearrangement or the correct sequence doesn't match any of the given sequences, select 'None of the above' as your answer.

Studies conducted / conclusively establish that (A)/ that must be dealt with (B)/ by various government agencies, NGOs, and the scientific community (C)/ climate change is a global crisis. (D)