What legal protection allows a witness to answer questions without the risk of self-incrimination?

The correct answer is immunity because it grants a witness the legal protection to provide testimony without the fear of self-incrimination. When a witness is given immunity, they are essentially promised that their statements cannot be used against them in a criminal case. This protection encourages witnesses to testify, even if what they have to say might otherwise expose them to criminal liability. It becomes crucial in investigations where significant information may be withheld due to concerns about self-incrimination.

In contrast, subpoena power compels witnesses to testify or produce evidence but does not protect them from the consequences of their testimony. Privilege allows certain relationships—like attorney-client or spousal relationships—to maintain confidentiality, but it does not specifically protect against self-incrimination. An affidavit is sworn written evidence but does not inherently provide any protections against self-incrimination either. Immunity is specifically designed to overcome these concerns, making it the clear choice in this context.