The passage lifts a specific sentence from a landmark PCIJ ruling on reparation for internationally wrongful acts, so the fastest way to the answer is recognising the source of that sentence rather than reasoning about state responsibility from scratch.
The correct answer is Chorzow Factory Case.
The bracket marks a quotation about riparian states sharing perfect equality of use over a navigable river, a very specific holding that points to one particular PCIJ case among the four options.
The correct answer is International Commission on the River Oder Case.
This bracket points to the classic description of sovereignty as coming bundled with a duty to protect other states' rights within one's own borders, a phrase closely associated with one particular arbitral award.
The correct answer is Island of Palmas Case.
The quoted duty not to let jurisdictional activities cause pollution damage to other states comes from a specific provision of UNCLOS 1982, and the answer turns on matching the exact wording to the exact article.
The correct answer is 194.
The phrase two states follow it repeatedly for a long time is the giveaway here, it describes local or bilateral custom, a narrower doctrine than the general custom most international law questions test.
The correct answer is Right of Passage over Indian Territory Case.
Sic utere tuo ut alienum non laedas, use your own property without harming another's, is the classical root of the international no-harm rule, and the challenge is picking the instrument that actually contains it, not just any instrument that touches environmental law.
The correct answer is Principles 21 and 22 of Stockholm Declaration.
Article 96 of the UN Charter splits advisory-opinion requests into two tiers, direct requesters and authorised requesters, and the options here test whether that split is understood correctly.
The correct answer is On the request of General Assembly or Security Council or both.
Auto-limitation says a state is bound by international law only because it has chosen, of its own sovereign will, to restrict itself, so the question is really asking which school treats state consent as the whole basis of legal obligation.
The correct answer is Positivist.
Polluter Pays is not confined to one treaty text, it recurs across general environmental law and sector-specific conventions, which is what this question is really testing.
The correct answer is All of the above.
Comparing the ICJ to the Supreme Court of India comes down to two things, how each acquires jurisdiction and who its rulings bind, and the options split along exactly those lines.
The correct answer is Its jurisdiction is limited to States which have consented to its jurisdiction and its judgements are binding only on the parties to the dispute.