A cantilever beam of length L and flexural modulus EI is subjected to a point load P at the free end. The elastic strain energy stored in the beam due to bending (neglecting transverse shear) is
A) (PL²)/(2EI)
B) (PL³)/(3EI)
C) (PL⁴)/(4EI)
D) (PL⁵)/(5EI)