Multi-choice problem: Continue writing the next sentence in this paragraph:

How to store christmas lights
Cut a piece of cardboard into a rectangle.
Roughly 12 inches by 6 inches should be fine. Make sure this is a heavier piece of cardboard, like from a packing box.

Options are:
[a]. If the cardboard is too light it will buckle when you wrap the lights around them. Cut a notch in one side of the cardboard..
[b]. This should be a size that is close to and well rounded. With the cardboard angled so that its edge is perpendicular to the ground, cut an equal length..
[c]. Cut two more pieces, covering the cardboard as much as possible. For extra security, try covering two less boxes at once..
[d]. Also make sure there is a draw (circle, rectangular, etc. ) shape on both sides of this rectangle, because it can be accidentally stepped on..
[a].