The correct answer is option 'D' - Aham and Puram. In the Sangam period, Tamil poetry was classified into two main groups known as Aham and Puram. Let's explore these two categories in detail.

1. Aham:
Aham refers to the subjective or personal aspect of poetry. It focuses on the emotions, feelings, and experiences of the individual. Aham poetry often revolves around love, romance, and personal relationships. It delves into the inner world of the poet and expresses their thoughts, desires, and aspirations. Aham poems are characterized by their lyrical and introspective nature.

- Aham poetry deals with the individual's emotions, experiences, and personal relationships.
- It expresses the poet's inner thoughts, desires, and aspirations.
- Aham poems are known for their lyrical and introspective nature.

2. Puram:
Puram, on the other hand, represents the objective or external aspect of poetry. It focuses on the external world, society, and the larger community. Puram poetry often explores themes of heroism, valor, war, and societal issues. It highlights the virtues, values, and struggles of the society as a whole. Puram poems are characterized by their narrative and descriptive style.

- Puram poetry deals with the external world, society, and the larger community.
- It explores themes of heroism, valor, war, and societal issues.
- Puram poems are known for their narrative and descriptive style.

In summary, Aham poetry represents the personal and subjective aspects of poetry, while Puram poetry represents the objective and external aspects. Both these categories played a significant role in Tamil literature during the Sangam period. They provided a comprehensive view of the society, encompassing both individual emotions and societal concerns.