In a citrus-based Build-A-Drink, how does lowering pH affect brightness and perceived sweetness, and what helps improve taste?

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Lowering pH makes the citrus base more acidic, which sharpens the drink’s brightness or liveliness—the tangy zing you feel in a lemony profile. That same acidity can also suppress or dull the perception of sweetness, because tartness competes with and masks sugary sweetness. To achieve a pleasant, balanced taste, you typically counterbalance that acidity with some sugar (or another sweetener), restoring sweetness and smoothing the overall flavor. So this option correctly describes how lowering pH enhances brightness while potentially dulling sweetness, and why adding sugar to balance acidity improves taste. The other ideas—like pH having no effect, or higher pH increasing brightness and sweetness—don’t align with how acidity shifts both brightness and sweetness perception in citrus drinks.