Step 1: Definition of territorial integrity
Territorial integrity is a fundamental principle in international law that respects the sovereignty of a state over its geographical territory. It prohibits external aggression, invasion, or any unauthorized intrusion.
Step 2: Meaning
It means the security and inviolability of a state's boundaries must be maintained. No other state has the right to violate or alter them forcibly.
Step 3: Explanation of other options
- Option B suggests interference, which is contrary to sovereignty.
- Option C talks about non-interference but is different from territorial integrity which focuses on boundaries specifically.
- Option D is invalid.
Therefore, option A is the correct answer.