Scarlett is designing a package for a candy her company makes. she has cut several cardboard equilateral triangles, squares, rectangles, and regular pentagons to try out her ideas for the package. which 3-d figure and combination of shapes can scarlett use?
a: equilateral triangle prism with two equilateral triangles and three rectangles
b: pentagonal prism with one pentagon and five rectangles
c: rectangular prism with four rectangles
d: square prism with four squares