premise: The 1921 NCAA football season had no clear-cut champion, with the "Official NCAA Division I Football Records Book" listing California Golden Bears, Cornell Big Red, Iowa Hawkeyes, Lafayette Leopards, Washington & Jefferson Presidents, and Vanderbilt Commodores as champions. Only California, Cornell, and Lafayette claim national championships for the 1921 season.
hypothesis: The Lafayette Leopards claimed the national championships for the 1921 season.
  
reason: The text specifies that they were among the teams to claim the title. My statement does not state they were the only ones to do it.