Correct option is B
In a beam of uniform strength, the bending stress remains constant along its length, as it is designed to carry a uniform load distribution. This means that while the bending moment may vary depending on the loading conditions and support reactions, the bending stress, which is a function of the bending moment and the moment of inertia, is kept uniform. This design feature helps in optimizing the material usage and ensuring consistent performance throughout the beam's length.
