What happens next in this paragraph?

How to make extra crispy roast potatoes
Preheat the oven.
Set the oven to 220c (425f/gas mark 7).
Parboil the potatoes.
Options: (a). Place the parboiled potatoes in an immersion pot filled with water. Simmer for about five minutes, stirring occasionally, then cook for a little longer.. (b). Fill a slow cooker with 2 to 3 inches (5 to 7.6 cm) of water. Place the potatoes in the water and allow the water to come to a boil.. (c). Put them in a small saucepan. Add 1/2 cup (120 ml) of water.. (d). Place the potatoes into a saucepan of water. Cover with the pan lid and bring to a simmer..
(d).