Maintaining the acid mantle helps prevent transdermal water loss. Which option correctly describes this function?

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The acid mantle is the thin, protective film on the skin that keeps the surface slightly acidic and supports the lipid barrier of the outermost layer. Maintaining this barrier prevents transdermal water loss by reducing evaporation from the skin and preserving hydration. In other words, the function described is preserving the acid mantle itself. The other options don’t describe how moisture loss is controlled: expanding pores isn’t a mechanism for preventing evaporation, increasing sebum production isn’t the direct way to maintain the barrier, and changing skin color has no relation to moisture retention.