Researchers recently discovered that lipstick can become contaminated with bacteria that causes mononucleosis. They found that contamination usually occurs after the lipstick has been used for six months. For that reason, women should dispose of any lipstick after six months of use.
Which of the following, if true, would most weaken the conclusion above?
A. The researchers could not discover why lipstick contamination usually occurred only after six months of use.
B. The researchers failed to investigate contamination of lipstick by viruses, yeasts, and other pathogenic microorganisms.
C. The researchers found that among women who used lipstick contaminated with bacteria that causes mononucleosis, the incidence of these diseases was no higher than among people who used uncontaminated lipsticks.
D. The researchers found that people who wiped their lipsticks clean after each use were as likely to have contaminated lipsticks as were people who never wiped their lipsticks.
E. The researchers found that, after six weeks of use, greater length of use of a lipstick did not correlate with a higher number of bacteria being present.
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