The correct answer is (a) Rajaraja-I.
Rajaraja-I was the first Chola king to conquer the northern part of Sri Lanka. He invaded the island in 993 CE and captured the capital city of Polonnaruwa. He then went on to conquer the rest of the island, bringing it under Chola rule.
Rajaraja-I was a powerful and successful ruler. He expanded the Chola Empire to its greatest extent and made it one of the most powerful empires in South Asia. He was also a patron of the arts and literature.
The other options are incorrect.
(b) Rajendra-I was the son of Rajaraja-I and succeeded him as king in 1014 CE. He continued his father’s expansionist policies and conquered much of South India and Southeast Asia.
(c) Parantaka-I was the grandfather of Rajaraja-I. He was a successful ruler who expanded the Chola Empire to include parts of South India and Sri Lanka.
(d) Aditya-I was the father of Rajaraja-I. He was a successful ruler who expanded the Chola Empire to include parts of South India.