Why Can't S Waves Travel Through Earth's Liquid Core

Why can't S waves travel through Earth's liquid core?

A) Earth's liquid core is creating its own S waves.
B) Earth's liquid core causes the seismic activity to be reflected back to its origin.
C) Earth's liquid core absorbs the waves.
D) Earth's liquid core is too hot and changes the wavelength of the S wave.
E) Earth's liquid core does not have the rigidity required for shear waves to travel along.