The existence in a case of a circumstance precluding wrongfulness in accordance with the chapter provides a shield against an otherwise well-founded claim for the breach of an international obligation.
The six circumstances are:
1. Consent (Article 20),
2. Self-defense (Article 21),
3. Countermeasures (Article 22),
4. Force Majeure (Article 23),
5. Distress (Article 24) and
6. Necessity (Art. 25).

The correct answer is E.