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

How to clean your cell phone
Turn off your phone and disconnect any power supply.
Remove the case and any screen protector. If you have cracks in your screen do not remove the protector.

Pick from:
a). You should leave the screen protector on the phone. Clean up the charger and power supply.
b). Remove your battery if you are able to do so. This may, however, invalidate your warranty.
c). Wash down the glass with an alcohol-based degreaser cleaner or a brush or vacuum. Put the newly cleaned cell phone in a clean, soft, airtight container.
d). Use a soft cloth to gently wipe away any cracks or gouges in the screen. The screen protector is a thin plastic container with two compartments that hold all the liquids that you'll use to clean your phone.
b).