What is the oldest Division I collegiate athletic conference at which the 1941 Wisconsin Badgers football team finished in fifth place?
1941 Wisconsin Badgers football team:  The team compiled a 3–5 record (3–3 against conference opponents) and finished in fifth place in the Big Ten Conference. Big Ten Conference: The Big Ten Conference (B1G), formerly Western Conference and Big Nine Conference, is the oldest Division I collegiate athletic conference in the United States.
the Big Ten Conference