A right rectangular prism has rectangular faces, with opposite faces that are equal and parallel, and right angles between adjacent faces.
Among the options provided:
- Figure a (triangular pie wedge) does not have rectangular faces.
- Figure b (rectangular book) has rectangular faces and meets the criteria.
- Figure c (house) does not have rectangular faces; it has slanted sides.
- Figure d (shopping cart) does not have the shape of a right rectangular prism; it is more complex.
Therefore, the object that has the attributes of a right rectangular prism is:
b (the rectangular book).