During the years between World War I and World War II, a great lesson was learned by our military leaders and the people of the United States. The lesson was that in the aftermath of World War I, we kind of turned our backs and left them to their own devices and they brewed up a lot of trouble that quickly became World War II.

Can we draw the following conclusion?
The military leaders were responsible for World War II.

 (A). Yes. (B). It's impossible to say. (C). No.
(B).