Critical Reasoning (CR) | An unknown simian virus recently killed off nearly half the human

MAGOOSH OFFICIAL EXPATIATION:

Answer: (C)

(A) is tempting, but the main problem with it is that it only tells us that the mortality rate is higher than that of any other virus. That doesn't mean that the Zairean strain is likely to cause a greater number of deaths! For example, let's say we have a population of 1000 people, in which 500 people got the simian virus and 50% die - that means that 250 people have died. Now let's say that 200 people get the Ebola virus and 75% die, which is only 150
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