We can infer all of the following about indigenous languages from the passage EXCEPT that:
Explanation:
Option (a) is mentioned in first paragraph, last line: "They function as vehicles for the transmission of cultural traditions, environmental understandings and knowledge ..."
Option (b) is mentioned in third paragraph.
Option (c) is not mentioned in the passage. The passage mearly suggest that indigenous languages are about much more than unusual words and intriguing grammar: They function as vehicles for the transmission of ... (first paragraph). It doesn't mentioned that grammar is challenging to document.
Option (d) is what the whole passage is about. First paragraph states - "... orality is fragile and contributes to linguistic vulnerability"
Hence, option (c).
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