Multi-select problem: How does the next paragraph end?

How to grow portobello mushrooms
Build a tray frame out of scrap wood.
Pick up some scrap wood from a lumber yard or purchase boards from a home improvement store. The frame should be about 8 in (20 cm) deep and at least 6 in (15 cm) long.

Select from: i. You can also use wood blocks from your yard to make a frame if you're not specific about where to plant the mushrooms. Design the illustration using 18x12 plywood.. ii. The lengths you need vary, but 6 in (15 cm) x 8 in (20 cm) works just fine. The frame should be 2 in (5 cm) wide and 8 in (15 cm) x 4 in (10 cm).. iii. Nail the wood together to form the bed. Instead of assembling a tray, purchase a mushroom-growing kit from a gardening store or online.. iv. Keep the frame upright on a clean board or table to get the necessary measurements before using it. Using wood is slightly simpler for beginners since you don't have to construct your own frame..
iii.