What does a subpoena require from an individual?

A subpoena is a legal document that commands an individual to appear in court as a witness in a legal proceeding. The primary purpose of a subpoena is to ensure that individuals attend court to testify or provide evidence relevant to a case. When a person receives a subpoena, they are legally obligated to comply with its terms, which often includes showing up at a specified time and place to provide their testimony.

The other options may involve various forms of involvement in legal matters, such as submitting evidence or writing statements, but they do not encapsulate the core requirement of a subpoena, which is the obligation to appear in court. Thus, the correct answer emphasizes the individual's obligation to attend court, underscoring the enforcement of legal processes in criminal justice.