(A)
- Stack with green block
- Stack with yellow block
- Stack with purple block

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

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

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