## The most appropriate answer does seem to be E, but as stated in the stimulus, the direct descendants of only the survivors were tested, hence the plague bacteria wasn't there(as they were the survivor's descendants and assuming this bacteria is necessarily inherited in all cases) but were positive for mutation Delta 32, this statement kind of proves that plague did not cause mutation Delta-32 and hence is not an assumption.
This would have been the perfect answer as an assumption if the conclusion
...
This would have been the perfect answer as an assumption if the conclusion
...
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