It is C: Cancer cells can travel either through the bloodstream or the lymph system.
Considering that they would come in contact with one another in the car, that would then be exposed to the disease as well. Since communicable disease can be passed on by direct contact.
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A word that describes medication, vitamins pesticides and household cleaners is obviously CHEMICALS. Chemicals are developed to bring utility and somehow comfort to what we do and what we need to do. Drugs and fresheners are chemicals. This is the best answer i could give you hope this helps.