People in medieval times believed that lice were beneficial for their health, because there hardly used to be any lice on
people who were unwell. The reasoning was that the people got sick because the lice left. The real reason
however is that lice are extremely sensitive to body temperature. A small increase of body temperature, such as in
a fever, will make the lice look for another host.
If the above statements are all true, then what was wrong with the reasoning of people in medieval times about the
connection between lice and disease?
A) They assumed that nothing else could lead to the disease except the lice
B) They assumed that a correlation was actually a cause and effect relation
C) They assumed that the sample size that they saw was representative of the entire population at that time
D) They mistook the cause of something for its effect
E) They assumed without warrant that a necessary condition is most definitely also going to be a sufficient one.