According to Cavalalieri’s Principle, if there are two solids of equal altitude (10ft pillars), the sections made by parallel planes are the same distance from the bases, they are always equal. If the figures have the same cross-sectional area (height x width) at every level and the same height, then the figures have the same volume. This means that the volumes of the two solids are completely equal. The shapes (pillars) have the same height, so their volume will be the same according to this.
If in two solids of equal altitude, the sections made by planes parallel to and at the same distance from their respective bases are always equal, then the volumes of the two solids are equal.
I think the answer is D because generally people don't make large scale monuments of random person they are normally famous or very important in some way
Hope this helps
