Step 1: Background
Mustafa Kemal Pasha, also known as Atatürk, led the Turkish War of Independence and established the Republic of Turkey in 1923.
Step 2: Contributions
He implemented wide-ranging reforms that modernized Turkey politically, socially, and economically, earning him the title "Father of Modern Turkey."
Step 3: Other options
- Celal Bayar and Ismet Inonu were important Turkish leaders but not founders of modern Turkey.
- Cemal Gursel was a later military leader and president.
Thus, Option (C) is correct.