A particle of mass m is projected with velocity v moving at an angle of `45^(@)` with horizontal. The magnitude of angular momentum of projectile about point of projection when particle is at maximum height, is
A. zero
B. `(mv^(3))/(4sqrt(2g))`
C. `(mv^(3))/sqrt(2g)`
D. `m^(2)sqrt(2gh^(3))`