The Onge of Little Andaman do not understand that language of the inhabitants of the North Sentinel Island though the islands are close-by. This indicates that they

Correct Answer: (C) are isolated from one another.

The Sentinelese and Onge are distinct Particularly Vulnerable Tribal Groups (PVTGs) of the Andaman Islands. Their linguistic barrier exists because the Sentinelese have remained in near-total isolation for centuries, having no contact with the outside world or even neighboring tribes. Unlike groups that interact through trade, these tribes maintained independent cultural and linguistic evolution. Options (A) and (D) are incorrect as isolation, not technology or trade, dictates their distinct linguistic development, while (B) is geographically false.