Correct option is D
In
deep beams or
thin webbed reinforced concrete (R.C.C.) members, the first crack that typically forms is a
diagonal crack due to tension. This is because in such members, shear forces are predominant, and when these shear stresses exceed the tensile strength of concrete, diagonal tension cracks develop. These cracks usually form at the points of maximum shear, often near the supports, and extend diagonally towards the load application point. Flexural cracks typically form later and are more prevalent in members subjected to bending stresses.
