Answer is beyond reasonable doubt.
The legal burden of proof necessary to uphold a criminal conviction is beyond a reasonable doubt. In the criminal proceeding, the prosecution carries the burden of demonstrating beyond all the reasonable doubt that the defendant is guilty for. This connotes that prosecution must persuade the jury that the evidence presented at the trial cannot be explained in any other way.
In other words, in order to return a guilty conviction, the jury must be almost confident of the defendant's guilt. This is a far higher threshold of proof than what the civil requirement is, it is known as the "preponderance of the evidence," that simply needs a certainty greater than 50%.
Therefore, the answer is beyond reasonable doubt.
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