Option 1: Mahendra Varman-I - This option suggests that Chalukya king Pulakesin-Il was defeated by Mahendra Varman-I. However, this is incorrect. Mahendra Varman-I was a Pallava king who ruled in the 7th century, while Pulakesin-II of the Chalukya dynasty was defeated by Narasimha Varman-I (also known as Mamalla) from the Pallava dynasty.
Option 2: Narasimha Varman-I - This option is correct. Narasimha Varman-I, also known as Mamalla, was a Pallava king who defeated Pulakesin-II of the Chalukya dynasty. This defeat marked a significant event in the history of South India.
Option 3: Parameswara Varman-I - This option suggests that Pulakesin-Il was defeated by Parameswara Varman-I. However, there is no historical evidence to support this claim.
Option 4: Jatila Parantaka - This option is incorrect. Jatila Parantaka is not a known historical figure associated with the defeat of Pulakesin-Il.
Therefore, the correct answer is option 2: Narasimha Var