Exp) Option b is the correct answer.

The history of early historical Tamilakam is reconstructed mainly from Sangam literature, inscriptions and archaeological evidence. The three major dynasties of this period were the Chera, Chola, and Pandya kingdoms. Their rulers frequently appear in Sangam poems in connection with warfare, trade, patronage of poets, and overseas contacts, particularly with the Romans.

Pair 1 is correct:Senguttuvan was one of the most celebrated rulers of the Chera dynasty. He was also known as the Red or Good Chera. He is remembered in the post-Sangam epic Silappadikaram as a powerful king who undertook military expeditions and patronised the cult of Kannagi, regarded as the goddess of chastity. Sangam traditions also describe him as having marched northwards, crossed the Ganga, and brought stone for constructing an image of Kannagi.

Pair 2 is incorrect:Udiyanjeral was an early ruler of the Chera dynasty, not the Chola dynasty He is considered one of the earliest known Chera kings and is associated with the rise of Chera political power in western Tamilakam.

Pair 3 is correct:Nedunjeliyan was a ruler of the Pandya dynasty. Several Pandya kings bearing this title are mentioned in Sangam texts. The Pandyas ruled mainly over the southern part of Tamilakam with centres around Madurai, which emerged as an important political and cultural centre during the Sangam age.

Source:

Tamil Nadu Board – Class 11 History – 2024 Edition – Unit 5 – Evolution of Society

in South India- The Sangam Age – Page 66 and 67

Ancient and Medieval India by Poonam Dahiya – Chapter 7 – Political and Cultural Developments During c. 200 BCE–300 CE – The Three Early Kingdoms: The Pandays, the Cholas, and the Cheras – Page 305 to 309

https://egyankosh.ac.in/bitstream/123456789/115670/3/Unit-14.pdf – Page 273