It can be inferred that C and D have the same volume.
For figures such as B, C, and D, with the top area is the same as the bottom area, the volume is the product of the base area and the height.
The base area of all these figures is the same, so those (among B, C, and D) with the same height have the same volume.
Here, C and D both have a base area of 20 cm² and a height of 5 cm, so both have the same volume.
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