eyewitness accounts
Explanation:
Testimony is an oral or written declaration by a person of a certain event or happening, usually giving in the court.
The other options can all be used as evidence or facts to support the statement, but only eyewitness accounts can be taken as testimony.
That is because only the person itself can orally confirm or deny the event, give a certain declaration about it and explain it. An eyewitness has to be a person, and their account, therefore, is taken as the testimony.