Arrange the following in chronological order. 

A. Conference of Parties (CoP-21) 

B. Earth Summit

C. World Summit on Sustainable Development 

D. Montreal Protocol 

Choose the correct answer from the options given below: 

1
B, D, C, A
2
D, B, A, C
3
D, B, C, A
4
B, C, D, A

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