A cantilever beam of length L experiences a bending moment applied at its free end. Given that EI represents the beam's flexural rigidity, what is the deflection at the free end?

Explanation

For a cantilever beam subjected to a bending moment M at its free end, the deflection δ at that end is given by δ = (M * L²) / (3 * EI), where L is the length and EI is the flexural rigidity. This formula accounts for the beam's bending stiffness and length, resulting in option D as the correct answer.