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Direction: Read the following information carefully and answer the questions that follow.

I. In an experiment conducted at a laboratory 160 white mice were injected with Serum D. 160 other white mice were injected with a harmless sugar solution. In two weeks time 39% of the white mice, who were injected with Serum D contracted the highly contagious and often fatal disease, jungle fever. Hence, it can be concluded that jungle fever is caused by some elements similar to the elements in Serum D.

The above discussion would be weakened most severely in case it is shown that

A)  People contracting jungle fever are usually the victims of the bite of the South American Lesser Hooded Viper.

B)  One among the 160 white mice had already contracted jungle fever prior to the laboratory experiment.

C)  The natural habitats of white mice do not contain any of the elements found in Serum D.

D)  The scientists administered the injections being ignorant of the contents of the solutions used.

E)  None of these