D. It suggests that sorrow accompanies the situation of language endangerment.
The first two paragraphs, particularly the quote from Natalia Sangama and the description of the Chamicuro language's situation, convey a sense of loneliness and loss associated with being the last speaker of a language. This evokes feelings of sorrow and highlights the emotional impact of language endangerment on individuals and communities. While other options may be relevant to the text as a whole, the sorrowful tone in these opening paragraphs specifically emphasizes the emotional aspect of the issue.