To convict for treason, their must be at least:
a. one witness
b. two witness
c. three witness
d. four witness

The answer is B. 2 witnesses

Explanation:

No Person shall be convicted of Treason unless on the Testimony of two Witnesses to the same overt Act, or on Confession in open Court. ... Under English law effective during the ratification of the U.S. Constitution, there were several species of treason.

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