Arrange the following environmental milestones in chronological order.

1.Antarctic Treaty

2.Vienna Convention for the Protection of the Ozone Layer

3.Stockholm Conference

4.Brundtland Report on Sustainable Development

A1, 2, 4, 3

B3, 2, 4, 1

C1, 3, 2, 4

D4, 1, 3, 2

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