Which of the following is a brown to black-colored American beer style with normal to elevated alcohol content (4.8-6.5% ABV) and pronounced bitterness?

The American Porter is indeed characterized by its brown to black color, which results from the use of dark malts that impart rich flavors and hues. This style typically has a normal to elevated alcohol content, falling within the range of 4.8% to 6.5% ABV, making it a versatile option for various drinking occasions. In addition to its color and alcohol profile, American Porters are known for their pronounced bitterness, which comes from the hop varieties used during brewing.

This style often exhibits chocolate, coffee, and caramel flavors, which are complemented by a balanced bitterness that adds to its complexity. The combination of malt sweetness and hop bitterness is what distinguishes American Porters within the broader category of dark beers.

Other styles listed may share similar traits, but they do not align perfectly with the specified characteristics of color, alcohol content, and pronounced bitterness as those attributed to American Porter.