The assertion and the reason are both correct and closely linked, hence justifying option 1 as the correct response.

The assertion asserts that the Aham and Puram poems, which belong to the Padinen Kilukanakku collection, can be perceived as a continuation from the Sangam era compositions. This affirmation acknowledges these poetic works not as unique entities, but as a part of a long-standing tradition and evolution.

The reason further elaborates on the assertion by stating that Aham and Puram poems are categorized under Post-Sangam works, contrasting them with the Sangam works proper. This classification belongs to the timeline after the Sangam period ended, agreeing with the assertion`s implication of these poems as a "continuation" of Sangam compositions. Therefore, the reason correctly explains the assertion, making option 1 the valid choice.