Which of the following is a characteristic of American stouts?

American stouts are known for their bold flavors and significant roast character. One of the defining characteristics of this style is the pronounced presence of roasted malt, which contributes to the coffee, chocolate, and sometimes ash-like flavors. This intense roastiness is a fundamental aspect that sets American stouts apart from other variations, such as dry stouts or imperial stouts, where the roast may be present but not as dominant.

In addition to the roasty flavors, American stouts often incorporate a balance of hoppiness, which can enhance the bitterness and complex flavor profile of the beer. This incorporation of hops can help round out the overall taste experience, complementing the deep roasted notes with a more vibrant character. The combination of these elements makes American stouts particularly rich and complex, supporting the assertion that they are "very roasty with coffee flavors."

The other characteristics listed, such as sweetness, low hopping, or light body with a crisp finish, do not align with the typical profile of American stouts. Instead, they may be more representative of other beer styles, hence why they are not considered defining characteristics of American stouts.