Correct Answer: Testimonial

Solution : The correct choice is the third option.

Explanation : A testimony is a formal statement testifying to someone's character and qualifications. While all the options relate to written statements or documents, a testimonial specifically refers to a formal statement that attests to someone's character or qualifications, often used in support or recommendation of an individual.
The meanings of the other options are as follows:

• Document: A written, printed, or electronic piece of information that provides evidence or serves as a record.
• Affidavit : A written statement confirmed by oath or affirmation, often used as evidence in court.
• Manuscript: A handwritten or typed document, especially an author's original text, before being published.

Therefore, the correct answer is testimonial.