Consider the following statements:Statement I: Article 6 of the Paris Agreement on climate change is frequently discussed in global discussions on sustainable development and climate change.Statement II: Article 6 of the Paris Agreement on climate change sets out the principles of carbon markets.Statement III: Article 6 of the Paris Agreement on climate change intends to promote inter-country non-market strategies to reach their climate targets.Which one of the following is correct in respect of the above statements?

1. A

   Both Statement II and Statement III are correct and both of them explain Statement I

   Both II and III are correct and both explain I. Article 6.2 and 6.4 set cooperative carbon-market routes (ITMOs and a UN mechanism). Article 6.8 is the non-market window. That dual design is why Article 6 is a standing COP agenda item on sustainable development and climate finance.

2. B

   Both Statement II and Statement III are correct but only one of them explains Statement I

   Both correct but only one explains I. Markets and non-market strategies are two halves of the same article. Both are why I is discussed.

3. C

   Only one of the Statements II and III is correct and that explains Statement I

   Only one of II and III is correct. Both hold.

4. D

   Neither Statement II nor Statement III is correct

   Neither. That would empty Article 6.

Summary. Official key is (a): Article 6 is discussed because it is the Paris rulebook for both carbon markets (II) and inter-country non-market cooperation (III). Both lines are true and both explain why Article 6 keeps coming up. (b) splits a pair that should stay together; (c) and (d) drop a true limb.