The most accurate summary regarding Chiang Kai-shek's role in modernizing China and the reaction to the Treaty of Versailles would be:
a) Chiang Kai-shek played a significant role in modernizing China by implementing economic reforms and infrastructure development.
Additionally, regarding the Treaty of Versailles, many Chinese people reacted with anger, particularly over the decision to grant former German territories in Shandong to Japan rather than returning them to China. This anger contributed to the May Fourth Movement, which sought to promote national unity and modernization, indicating that there was significant discontent with the international outcomes of the Treaty. However, for the purpose of your question focusing on Chiang Kai-shek's role, option (a) best sums up his contributions.
If you specifically want to address the reactions of the Chinese people to the Treaty of Versailles in combination with Chiang Kai-shek's role, that aspect requires additional context outside the options given.