(Solved): A concrete beam is under-reinforced and initially not loaded. The beam is subsequently loaded until ...

A concrete beam is under-reinforced and initially not loaded. The beam is subsequently loaded until failure. A list of possible events occurring before and up to failure is given. 1. The reinforcement and concrete act within their elastic limits. II. The stress distribution in the concrete becomes nonlinear. III. The yield point of reinforcement is reached. IV. The neutral axis moves upward with stress and strain varying proportionally. V. The concrete compressive strength is exceeded. VI. The reinforcement breaks. VII. The concrete crushes. Which of the following events most accurately describe the failure of the beam? O A. I, II, and VII OB. II, III, VI, and VII OC. I, II, IV, V, and VI OD. I, II, III, IV, and VII