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A
For appearance only
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B
Because they can harbor and transmit bacteria and fungi between clients if not properly disinfected
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C
To save water
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D
It is optional
Why this is the answer
Pedicure foot baths and basins must be thoroughly cleaned and disinfected between every client because warm water and skin contact create conditions where bacteria and fungi can build up, and improperly cleaned basins have been linked to skin infections. Proper procedure includes removing debris, cleaning, and disinfecting with an EPA-registered product (and following any required steps for jetted basins). Diligent foot-bath disinfection is one of the most emphasized sanitation points in pedicure services because of the real infection risk involved.
Source: Skin & Nails — Foot Bath Disinfection