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Headrest covers must be changed:
For each patron
Whenever they get soiled
For every other patron
For every three patrons
The correct answer is: For each patron
Headrest covers must be changed for "each" patron as it is hygienic to provide every customer/patron with a clean, unused cover. Option B ("whenever they get soiled") may seem reasonable to consider, but it does not account for patrons sharing the same headrest cover nor does it ensure proper sanitation. Option C ("every other patron") would result in some patrons using dirty covers, and option D ("every three patrons") is not as frequent as option A and could lead to unclean covers being used by multiple patrons. Therefore, option A is the most appropriate choice.