As Protestantism spread the catholic church began it own reform. What does it tell us about catholic leaders?

This tells us that Catholic leaders recognized the need for reform within their own church in response to the challenges posed by Protestantism. They acknowledged that there were issues that needed to be addressed and took steps to make changes within the Catholic Church to address these concerns. This shows that Catholic leaders were open to self-reflection and improvement, and were willing to adapt and reform in order to better serve their followers and maintain their authority in the face of changing circumstances.