Which breed is a part of the semi arch category?

The correct choice, the American breed, belongs to the semi-arch category of rabbit shapes. Semi-arch rabbits exhibit a moderate arch to their body structure, being neither completely flat like a commercial breed nor as arched as some of the more extreme breeds. This breed has a robust and well-rounded appearance while still maintaining that semi-arched shape, characterized by a smooth transition from the shoulders to the hips.

The other breeds mentioned, such as the Tan and the Belgian Hare, have distinct body shapes that do not fit within the semi-arch classification. The Tan breed is known for its unique marking and athletic build rather than the moderate curvature typical of semi-arch breeds. The Belgian Hare, while striking with its elongated body and hare-like features, also does not align with the semi-arch category but rather is classified as more of a full arch breed. Similarly, the Britannia Petite is categorized as a compact breed, featuring a rounded body shape and not falling under the semi-arch classification.