The correct answer is Prithviraj Chauhan.
Prithviraj Chauhan was a Rajput king who ruled the Chauhan kingdom of Ajmer from 1178 to 1192. He is best known for his resistance to the early Islamic invasions of India. In 1191, he defeated Muhammad Ghori, the Sultan of Ghur, at the First Battle of Tarain. However, he was defeated and killed by Ghori in the Second Battle of Tarain in 1192.
Jaichand was a Rajput king who ruled the Gahadavala kingdom of Kanauj from 1170 to 1194. He is best known for his opposition to Prithviraj Chauhan. He allied himself with Muhammad Ghori in order to defeat Chauhan. However, Ghori betrayed Jaichand and captured Kanauj in 1194.
Rana Sanga was a Rajput king who ruled the Mewar kingdom from 1509 to 1527. He is best known for his resistance to the Mughal Empire. He defeated the Mughal emperor Babur at the Battle of Khanwa in 1527. However, he was defeated and killed by Babur at the Battle of Ghaggar in 1529.
Rana Pratap was a Rajput king who ruled the Mewar kingdom from 1572 to 1597. He is best known for his resistance to the Mughal Empire. He fought against the Mughal emperor Akbar for 25 years. He never surrendered to the Mughals and died fighting them.
Prithviraj Chauhan is the most famous Rajput ruler because he was the first to resist the early Islamic invasions of India. He was a brave and skilled warrior who fought against the invaders with all his might. He is a symbol of Rajput pride and courage.