Discussion
When a taxon is restricted to a particular geographical region, then it is called :
Answer: A
A taxon confined to one particular geographical region is called endemic.
Endemism describes distribution: the species, genus or family occurs naturally in that region and nowhere else, such as the lion-tailed macaque of the Western Ghats.
The other three are IUCN threat categories that describe risk of extinction, not range. 'Low risk' was an older category for taxa not threatened, 'Threatened' groups the vulnerable, endangered and critically endangered categories, and 'Critically endangered' is the highest risk short of extinction in the wild. An endemic species may or may not be threatened.
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