D should be the answer. AsC states that there is no proof that the decline in Stellars is due to outside dangers, but that is not the point, the point is whether the Stellars are endangered and thus should be protected from outside dangers. Question stem states that the population has been declined by 2/3 i.e. 66%. But in optionD , it is clearly stated that in order to put on list of endangered specie, population of that specie must be declined by 90%, this clearly shows flaw in the argument.
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