Which of the following is considered a desirable characteristic of acidity in coffee?

A sharp but pleasing taste is considered a desirable characteristic of acidity in coffee because it contributes to the overall flavor profile in a way that enhances the cup's complexity and brightness. This type of acidity can give coffee a lively and vibrant quality, making it more enjoyable to drink. It's often compared to the crispness of fresh fruits, which can evoke positive sensory experiences.

In contrast, a strong sour taste may be overwhelming and off-putting, while overpowering bitterness is generally undesirable as it can mask more subtle flavors. A bland taste profile suggests a lack of distinct or interesting flavors, leading to a less engaging coffee experience. Therefore, the sharp yet pleasing quality of acidity is what makes it a sought-after attribute in high-quality coffee.