Which of the following is a trait of an Imperial Stout?

An Imperial Stout is known for its intense flavors and robust characteristics, making assertive roast flavor a defining trait. This style typically features a rich profile that includes dark roasted malt flavors, leading to notes of coffee, chocolate, and caramel. The roasting process of the malts contributes significantly to this assertiveness, resulting in a bold and complex beer.

In contrast, the other options describe qualities that are not typical of Imperial Stouts. A light body does not align with the style, as Imperial Stouts are characterized by their fuller, heavier mouthfeel. Low bitterness is also at odds with the typical profile, as these stouts usually have a notable bitterness to balance the sweetness from residual sugars and malt. Fruity notes are generally more characteristic of certain other beer styles, such as IPAs or pale ales, rather than the heavily roasted nature of an Imperial Stout.