A Brahmin is a member of the highest caste or varna in Hinduism. The Brahmins are the caste from which Hindu priests are drawn, and are responsible for teaching and maintaining sacred knowledge.

The correct answer is option 'D' - Brahmins.

The caste system in ancient India was a hierarchical social structure that divided society into different groups based on occupation, birth, and social status. At the top of this social ladder were the Brahmins.

The Brahmins were considered the highest caste and were associated with the priestly class. They were responsible for performing religious rituals, studying and teaching the Vedas (ancient religious texts), and providing spiritual guidance to the society. Due to their religious knowledge and expertise, they held significant influence and power in ancient Indian society.

The Brahmins were believed to have emerged from the mouth of the Hindu god, Brahma, symbolizing their purity and importance in the social order. They were considered to be the custodians of knowledge and were respected for their intellectual abilities. As a result, they were accorded privileges and special rights in society.

The Brahmins were traditionally exempted from manual labor and were supported by the other castes. They were entitled to receive offerings and donations from the community for performing rituals and other religious ceremonies. They also enjoyed certain legal and social privileges, such as being able to adjudicate disputes and having control over religious and educational institutions.

Furthermore, marriage within the Brahmin caste was preferred, and intermarriage with other castes was discouraged. This was done to maintain the purity of the Brahmin lineage and to preserve their social status.

Overall, the Brahmins held a position of power and authority in ancient Indian society due to their association with religion, education, and intellectual pursuits. They played a crucial role in shaping and maintaining the social order of the time.