Critical Reasoning (CR) | Re: Five years ago, during the first North American outbreak

We need to find an argument that weakens the conclusion - "It is clear, therefore, that during these past 5 years, CXC has increased in virulence."

(A) Many recent cattle deaths that have actually been caused by CXC have been mistakenly attributed to another disease that mimics the symptoms of CXC. -If we correct the mistake in this argument then we can see that CXC actually increases the number of deaths. hence, its a strengthener

(B) During the first North American outbreak of the
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