Which of the following beers has an IBU range of 8-20?

Witbier falls within the IBU (International Bitterness Units) range of 8-20, which indicates a low to moderate level of bitterness. This Belgian style is known for its refreshing character and is often brewed with spices such as coriander and orange peel, contributing to its unique flavor profile. The lower IBU level reflects the beer's balance, emphasizing its malt sweetness and pronounced fruity esters rather than bitterness.

In contrast, Belgian Blonde Ales typically have a slightly higher IBU range, often reaching up to 30, because of their higher hop character. Belgian Pale Ales can also exhibit a bit more bitterness, generally ranging from 20 to 35 IBUs, as they showcase a more robust malt and hop presence. Belgian Tripels are known for their bold flavor and higher alcohol content, which often translates to an IBU range from 20 to 40, emphasizing a more assertive bitterness than that found in Witbier. Thus, Witbier is the option that clearly fits the specified IBU range.