Describe the two-dimensional shape made by slicing a rectangular prism vertically, perpendicular to the base

A. Triangle
B. Rectangle
C. Square
D. Hexagon

B. Rectangle

When a rectangular prism is sliced vertically, perpendicular to the base, the resulting shape will be a rectangle. This is because the cross-section of a rectangular prism in this orientation will have two pairs of parallel sides and opposite angles that are equal.