The correct answer is D. The Kula (Family).
The Kula was the basic unit of social and political organization in the Rig Vedic period. It was a patrilineal extended family, consisting of a man, his wife or wives, their children, and unmarried siblings. The Kula
was headed by the eldest male, who was responsible for making decisions on behalf of the family.The Kula was a self-sufficient unit, with its own land, livestock, and other resources. It was also a religious unit, with its own rituals and ceremonies. The Kula was the basic unit of society in the Rig Vedic period, and it played a vital role in the social, political, and religious life of the people.
The other options are incorrect.
A. The Samaj is a modern term used to refer to a society or community. It is not a term that was used in the Rig Vedic period.
B. The Smriti is a collection of Hindu laws and scriptures. It is not a term that was used to refer to a social or political organization in the Rig Vedic period.
C. The Sabha is a council of elders. It is not a term that was used to refer to a social or political organization in the Rig Vedic period.