Final answer:
A pyramid and a cone with the same volume and height will have the same horizontal cross-sectional area. The answer is option D.
Step-by-step explanation:
A pyramid and a cone with the same volume and height will not have the same cross-sectional areas.
A. The area of the cross-sections of the pyramids and cones are not multiples of each other.
B. The cross-sections of the pyramids and cones are not the same shape. The pyramid has a polygonal base, while the cone has a circular base.
C. The vertical cross-sections of the pyramids and cones at the same width may have different areas.
D. The horizontal cross-sections of the pyramids and cones at the same height must have the same area.