Final answer:
The evidence supporting the liquid nature of the Earth's outer core is the disappearance of the S-wave and the marked slowdown of the P-wave.
Step-by-step explanation:
The evidence used to support the belief that the outer core of the Earth is liquid is the disappearance of the S-wave and the marked slowdown in the P-wave.Shear or transverse waves cannot travel through a liquid, so the fact that the S-wave disappears suggests that the outer core must be liquid. Additionally, the P-wave travels slower in the outer core compared to the rest of the Earth, indicating that it is passing through a liquid medium.Therefore, the correct answer is c. Both A and B.