The statement that accurately summarizes the role Chiang Kai-Shek had in modernizing China and how the Chinese reacted to the Treaty of Versailles is:
"Chiang Kai-Shek unified China, and protests erupted in Beijing due to the Treaty of Versailles."
This reflects Chiang Kai-Shek's leadership in unifying China and the resultant protests stemming from the dissatisfaction with the terms of the Treaty of Versailles, which transferred German concessions in China to Japan, leading to significant public outrage.