What major change occurred to the Turtles in 1975?

In 1975, the major change that occurred to the Turtles was their transition to becoming part of the Professional Rodeo Cowboys Association (PRCA). This shift represented a significant evolution in their organizational structure, consolidating their efforts and aligning them with a larger, recognized governing body for rodeo competitions.

This change was important as it helped to standardize rodeo practices, promote professional recognition, and improve the overall structure of rodeo events. By joining the PRCA, the Turtles could participate in a more official and regulated arena, which ultimately elevated the sport's profile and enhanced opportunities for participants and events.

Other options, while plausible, do not capture this pivotal moment in the history of the Turtles, which was foundational in shaping the direction of rodeo organizations moving forward.