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

How to clean stairways with coarse carpeting
Start at the top of the staircase.
Using your broom, sweep horizontally across the top stair. Make sure to get any visible debris all to one side of the stair.

Choose from: A). Sweep horizontally for at least 3 turns; this should eliminate all the debris coming from all sides of the stairs. To prevent the effect of the dirt on the carpeting, hold the broom behind the stair when you are working.; B). Use a stiff mop, dustpan, or broom to work the debris from the treads. Start with two or three steps and work up from there.; C). If there is debris on the staircase going up, you should put it out of view. Mop the upper section of the stairway in one long, three step sweeping motion.; D). To get this done right, you may need to press down hard while sweeping across. Sweep the debris you collected down to the next stair.;
D).