Write the next sentence in this paragraph:

How to locate a leak in an air mattress
Remove sheets and bedding from the air mattress.
You won't be able to see holes or tears in the mattress with the bedding on.
Move the bedding to a safe place, away from the area where you will look for leaks so that its out of the way.

Select from:
[A]. Move the air mattress to a place where you have room to maneuver. You will need to be able to walk around the mattress, flip it, and inflate it.
[B]. Locate the leak by looking at a thumb-sized hole in the bottom of the mattress. Wait for a rapid pulse or other sound to accompany the measurement.
[C]. Throw away the sheets that are used to cover the mattress. Check spots where additional sheets may trap trapped air.
[D]. Also ensure that you wear gloves to protect your hands and face. Remove the top two sheets from the mattress.
[A].