Which of the following is a characteristic of the Saison beer style?

The correct choice reflects the general characteristic of the Saison beer style, which is known for its moderate level of bitterness. The International Bitterness Units (IBU) range of 20-35 for Saisons indicates that these beers can have a noticeable hop presence that contributes to the drink's complexity and balance but are not overwhelmingly bitter. This bitterness often complements the fruity and spicy yeast characteristics typical of the style.

The other characteristics associated with Saisons, while specific to certain examples, may vary more widely. The standard range for alcohol by volume (ABV) is somewhat higher than the given range, typically around 5-7.5%. The standard reference method (SRM) color range in some Saisons can exceed the selected range, illuminating the diversity in color from pale to darker varieties. Original gravity (OG) can also vary outside the stated parameters depending on the specific brewing process and ingredients used. Thus, the IBU range of 20-35 effectively captures the essence of the Saison style's flavor profile.