Which is the best revision of the sentence?
Tension will erupt in the room when it was revealed that
the villain knew that the spy withholding information.
Tension erupted in the room when it reveals that the
villain knew that the spy withholding information.
Tension erupted in the room when it was revealed that
the villain will know that the spy withholding information.
Tension erupted in the room when it was revealed that
the villain knew that the spy withheld information.