Which of the following best explains why de-Sanskritization occurs in some regions of India?

The influence of dominant non-Brahmanic castes became stronger than that of Brahmanic groups.

The correct answer is option 3: The influence of dominant non-Brahmanic castes became stronger than that of Brahmanic groups.

In regions where non-Sanskritic castes were dominant, their customs and practices exerted a greater influence than those of highly Sanskritised castes. This process is termed de-Sanskritisation.

NCERT: It is primarily a process that takes place within the Hindu space though Srinivas argued that it was visible even in sects and religious groups outside Hinduism. Studies of different areas, however, show that it operated differently in different parts of the country. In those areas where a highly Sanskritised caste was dominant, the culture of the entire region underwent a certain amount of Sanskritisation. In regions where the non-Sanskritic castes were dominant, it was their influence that was stronger. This can be termed the process of ‘de-Sanskritisation’. There were other regional variations too. In Punjab culturally Sanskritic influence was never very strong. For many centuries until the third quarter of the 19th century, the Persian influence was the dominant one.