Final answer:
The principle that says soft tissue will model along the lines of stress is Wolff's law, which applies to the way bones adapt to stress by remodeling themselves.
Step-by-step explanation:
The principle that states soft tissue will model along the lines of stress is known as Wolff's law. This biological concept describes the process of bone modeling and remodeling in response to the mechanical stresses they face. According to Wolff's law, bone tissue is laid down where needed and resorbed where not needed, effectively adapting to the stress. This law predicts that, over time, the internal structure of the bone will change to align with the direction of the applied force.
Considering the other options, Davis's law pertains to soft tissue such as muscles, tendons, and ligaments, adapting to the stress they undergo. The Overload principle refers to the idea that a greater than normal stress or load on the body is required for training adaptation to take place. Archimedes' principle deals with buoyancy and is related to physics rather than biology.