This hypothesis [separation of powers] supposes human wisdom competent [capable] to the task of instituting three co-equal orders in government. . . . Mr. Adams . . . has not been able to adduce [find] a single instance of such a government. . . . If such an organization of power were practicable [able to be used], how long would it continue? Not a day. Which statement supports the author’s main claim?

A government of three branches with equal powers does not exist anywhere else.
Humans are capable of creating a fair system using separate powers.
Past governments have created separate powers on many occasions.
It is likely that the government will function successfully by separating powers.