Richard Nixon was the President that authorized the creation of the "plumbers".
It was also called the White House Plumbers and they were a secret White House Special Investigations Unit that was created on 1971 during the presidency of Richard Nixon.
These White House Plumbers was created to perform the main task of stopping the leaking of classified information such as the Pentagon Papers to the news media.
Hence, during the tenure of Richard Nixon as the President, he authorized the creation of the "plumbers".
Therefore, the Option A is correct.
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