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

(B)
- Stack with green block
- Stack with purple block, yellow block, red block, from bottom to top

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

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