Final answer:
A pH-balanced product is typically slightly acidic, akin to the skin's natural pH, and usually has a pH value ranging from 4 to 6, corresponding to option B) 4-6. The pH scale spans from 0 to 14, with values below 7 being acidic and above 7 being alkaline, while 7 is neutral. The bicarbonate system buffers blood pH in the human body.
Step-by-step explanation:
When a product is described as pH balanced, it typically means that it has a pH that is close to that of the skin, which is usually around 5.5, falling into the slightly acidic category. Thus, a pH-balanced product should ideally be slightly acidic to maintain the skin's natural barrier.
However, the term pH balanced can be somewhat vague and can variably mean that the product has a pH close to neutral (pH 7), which is neither acidic nor alkaline, and is often perceived to be more gentle and less likely to cause irritation.
Consequently, when referring to the given options, 'pH balanced' most accurately correlates with option B) 4-6, which represents the pH range that is generally compatible with the skin's natural pH.