When Theodore Roosevelt assumed the presidency in 1901, a. he became a champion of immediate, radical change. b. he both was relatively unknown within the presidency in 1901 and became a champion of immediate, radical change. c. Republican leaders were confident they could control him. d. None of these answers is correct. e. he was relatively unknown within the Republican Party.

Explanation: The correct answer is A: He became a champion of immediate, radical change. He carried out this purpose with the implementation of his internal policy, exactly with his Square Deal programs, which consisted of the aid to the middle social class and in the same way, with the implementation of his international policy through the application of the doctrine of the Big Stick, which consisted of maintaining pressure on their adversaries before any negotiation they had to achieve the expected purposes.