Question

Under Roman law, someone accusing another person of a crime needed belief that the accused was guilty. proof that a crime had been committed. a lawyer willing to take the case to trial. a witness to vouch for the accuser’s character.

Answer 1

The romans didn't use lawyers, so I would say your answer was: a. witness to vouch for the accuser’s character.
Was that what you needed? :D

Answer 2

a witness to vouch for the accuser’s character.