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SJ2006
As it's base is pentagon, it means it has some other sides (4 actually), which are of some other kind of shape.

So, option C) Pentagonal Pyramid is your correct answer.

Hope this helps!
MissPhiladelphia
Because there is only one base, it is not a prism. It is not a cube because the sides of cubes are all squares. A pentagon is a 2-dimensional shape. So, the remaining choice is c.