What is the best way to: What supplies are needed to build a treeless tree house?

Pick your answer from:
A). Six cement blocks (I HIGHLY recommend the kind with epoxied-in metal post brackets. Although they are more pricey, they are much more secure and allow for easily adjusting post and block assemblies. More on that as we go along.) Six 8-foot pressure treated 4x4 posts Six 8-foot pressure treated 2x6 boards One 4- by 8-foot 3/4" board OSB (same dimensions in exterior grade plywood is another option) Approximately twenty 8-foot 2x4 boards Four 10-foot 2x4 boards Five 26" x 8' corrugated plastic roof panels One box (50 pcs.) of roofing screws for corrugated panels (the kind with built-in rubber washers) 5 lb. box of 3" exterior grade screws 5 lb. box of 1 5/8" exterior grade screws Two 50 lb. bags of general purpose sand Gallon of waterproof sealer Gallon of deck restoring paint.
B). Six cement blocks (I HIGHLY recommend the kind with epoxied-in metal post brackets. Although they are more pricey, they are much more secure and allow for easily adjusting post and block assemblies. More on that as we go along.) Six 8-foot pressure treated 4x4 posts Six 8-foot pressure treated 2x6 boards One 4- by 8-foot 3/4" board OSB (same dimensions in exterior grade plywood is another option) Approximately twenty 8-foot 2x4 boards Four 10-foot 2x4 boards Five 26" x 8' corrugated plastic roof panels One box (50 pcs.) of roofing screws for corrugated panels (the kind with built-in rubber washers) 5 lb. box of 3" exterior grade screws 5 lb. box of 1 5/8" exterior grade screws Two 50 lb. bags of general purpose flour Gallon of waterproof sealer Gallon of life restoring paint.
Answer:
A).