Which of the following does not explain why Americans expect the president to provide strong leadership?

Question

the weakness of Congress
the president has great prestige as chief of state
there is only one president
the Constitution says the President is "the chief" of the government

Answer 1

I must say the teacher who dumped this on you has a funny idea of American politics. But nevermind.

The only one that might fail to explain why the president is responsible for being a strong leader would be "the weakness of Congress." Congress is not actually weak. Bungling, self-interested, possibly even corrupt, but not really weak.