What does "massive" indicate about a rabbit's build?

The term "massive" when referring to a rabbit's build indicates that the rabbit is ponderous or large. This descriptor conveys a sense of bulkiness and indicates that the rabbit has a well-developed body structure with significant weight and size. A massive build usually suggests strong bone structure and musculature, which can affect the overall health and physical capability of the rabbit.

In contrast, the other options describe characteristics that do not align with the meaning of "massive." For instance, a weak and fragile build would imply a lack of strength, while a flat and thin build suggests a more streamlined and lightweight appearance. Similarly, a small and lightweight rabbit would not be described as massive, as this term inherently suggests a larger size and presence rather than a diminutive one.