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.

The global refugee crisis / across the world because of persecution, conflict, and violence (A)/ who then seek protection, refuge, and asylum (B)/ refers to the forcible displacement of millions(C)/ in countries or regions that are safer (D).