C. To immediately establish a straightforward and matter-of-fact tone
Sentence 3 expresses the claim of pediatricians who have children take better care of patients.
As is the case with any disinfectant, it must be applied for at least 10 minutes in order for the chemicals present in the disinfectant to have the appropriate amount of time to act upon the surface on which it is being applied.
Disinfectant agents use a cocktail of chemicals and antibiotics to kill almost all germs that may be present on a surface. However, some bacteria and viruses are affected slower than others. It can be said that they are more resistant than others of their kind.
Given that different kinds of bacteria possess distinct levels of antibiotic resistance, a user of a disinfectant spray or solution should allow at least 10 minutes for the disinfectant agent to act on the surface in question in order to have the highest likelihood of achieving a completely sterile surface.
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