Final answer:
The correct formula for bending stress is B) Bending stress = Bending moment / Second moment of area, used in engineering to analyze the stress in beams.
Step-by-step explanation:
The formula for bending stress is defined as the bending moment divided by the product of the second moment of area and distance from the neutral axis. Therefore, the correct answer is B) Bending stress = Bending moment / Second moment of area (I), often expressed as σ = M/I where σ is the bending stress, M is the bending moment, and I is the second moment of area. This formula is used in engineering to determine the stress in a beam or other structural element when it undergoes bending.