Reason (R): They were included under the post-Sangam works as against the Sangam works proper.
Explanation
Sangam literature refers to the ancient Tamil literary corpus, composed between 300 BCE and 300 CE, which includes poems celebrating heroism, love, and ethics. Notable works include the Tolkappiyam, the earliest Tamil grammar text, and the Ettuthokai and Pattupattu, which offer insights into the socio-political and cultural life of Tamil kingdoms. A is true: The Padinen Kilukanakku is a collection of 18 post-Sangam Tamil literary works, divided into Aham (love) and Puram (war) genres. These works are considered a continuation of the Sangam literature in terms of themes, style, and language. They reflect the same poetic traditions and cultural values as the Sangam compositions. R is true: The Padinen Kilukanakku is classified as post-Sangam literature because it was composed after the Sangam period proper. While the Sangam works are the earliest Tamil literary compositions, the Padinen Kilukanakku texts were written later during the post-Sangam period (circa 300-600 CE). R is the correct explanation of A: The Padinen Kilkanakku texts though composed in the Post-Sangam period but carry forward the Aham and Puram poetic traditions of the Sangam era, thereby forming a continuation of the earlier compositions.