Correct answer: (b) 4, 2, 3, 1
Explanation
- A
1, 4, 3, 2
1, 4, 3, 2 puts Rio (1992) first, which is last among these four.
- B
4, 2, 3, 1
4, 2, 3, 1 is the order: Limits to Growth 1972, Brundtland Report 1987, Montreal Protocol in force 1989 (signed 1987), Rio Earth Summit 1992. That is the official key.
- C
4, 3, 2, 1
4, 3, 2, 1 would place Montreal before Brundtland. Our Common Future (March 1987) precedes the September 1987 Montreal signing and the 1989 entry into force.
- D
4, 1, 3, 2
4, 1, 3, 2 puts Rio second, decades too early relative to Montreal and Brundtland.
Summary. Official key is (b) 4, 2, 3, 1. Club of Rome, then sustainable-development report, then ozone protocol enforcement, then UNCED at Rio. Honour the stored letter (b).
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