Why is witness protection necessary in cases of human rights violations?

So that witnesses can speak the truth without fear

Witness protection is based on the principle that justice requires reliable evidence given freely and without intimidation. In human-rights cases, alleged offenders may possess authority, money or social influence, so a witness may face threats, harassment, dismissal or physical danger. Option A is correct because protection can encourage truthful testimony and help investigators and courts establish what happened, identify responsibility and provide remedies. It does not guarantee a particular verdict; it safeguards the process. B and C would destroy evidence and fairness, while D would prevent accountability. Effective protection may include confidentiality, safe accommodation, security or other lawful safeguards suited to the risk.

This is a Class 9 Civics question. Chapter: Democratic Rights. Topic: Human Rights and their protection.