Write the next sentence in the following story.

How to level a mobile home
Remove the skirting (optional on some) from around your home to gain access to the piers on which the supports sit.
Begin at the middle of your mobile home to check the level at each pier.
Place a long level at the nearest pier to the center and check the bubble in the center of the level; if it is centered, the area is level.

pick from the following.
(A). If the bubble is not centered, it means the pier is not level. Level the pier by clicking the drill mander button on the upper-left edge of the screen.;
(B). Mark any piers that are not level and proceed to the next steps. Attach a plastic tube to a bucket or other container with a capacity of about 5 gallons (19 l).;
(C). Identify the places where the piers cross (or be parallel with them if they cross each other). And mark each pier using a pencil and compass.;
(D). The bubble will dissipate into the water as it goes down, making the container level. The bubble should have a light bulb at its base and a pipe at its bottom.;. The answer should be
(B).