(A)
- Stack with purple block, red block, blue block, from bottom to top

(B)
- Stack with red block
- Stack with green block
- Stack with yellow block

(C)
- Stack with red block, blue block, purple block, from bottom to top

(D)
- Stack with red block
- Stack with green block, orange block, from bottom to top
- Stack with blue block, yellow block, from bottom to top