What would happen if the evidence had been provided?

The reasoning behind the choice that indicates the prisoner would have been acquitted hinges on the conditional scenario posed in the question. It suggests that if evidence had been available, it would have likely been strong enough to influence the outcome of the trial in favor of the prisoner.

In legal terms, to be acquitted means that the individual is found not guilty of the charges against them, often due to lack of evidence or the presence of evidence that disproves the prosecution's case. Therefore, if the necessary evidence had been presented, it could have led to a different verdict, where the jury or judge would have had reason to believe in the defendant's innocence, ultimately resulting in an acquittal.

This reasoning aligns directly with the implications of the conditional statement, focusing on the role that evidence plays in the judicial process and the likelihood of a favorable verdict for the prisoner should that evidence have been available.