What distinguishes American barleywines from British barleywines in regard to hops?

American barleywines are characterized by a higher level of hopping compared to their British counterparts. This distinction arises from the brewing traditions and ingredient preferences in the two styles. American barleywines often employ a variety of hops that contribute not only bitterness but also a bold hop aroma and flavor, including notes of citrus, pine, and resin.

Additionally, American brewers tend to lean towards using more aggressive hopping techniques and higher quantities of hops, reflecting the American craft beer movement's emphasis on hop prominence. In contrast, British barleywines generally feature a more balanced profile, where malt takes precedence over hop presence, resulting in a sweeter, less hop-forward beer.

The other options do not accurately describe the differences between American and British barleywines, as American examples are known for their robust hop character rather than a lower hop content, lack of filtering, or absent hop character.