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

How to prevent mildew on a shower curtain
Use a shower curtain or liner with a smooth, consistent surface.
Shower curtains with raised or etched patterns may allow moisture or water to collect in certain areas; whereas a smooth curtain will allow water to glide down into the drain.
Ventilate your bathroom during and after your shower.

Choices:
(I) This procedure will help your bathroom dry at a faster rate and help eliminate moisture buildup. Open the window in your bathroom or turn on the ventilator fan to help remove excess moisture..
(II) This will help to prevent mildew from developing that will infect your shower curtains and shelves as often as possible. Schedule an appointment with a plumber or bathroom contractor..
(III) Since mildew spores thrive in poorly ventilated spaces, never place a shower curtain in an unventilated area. Therefore, do not bring a shower curtain into your home that must be covered or can be ventilated..
(IV) Using a shower curtain or liner can do wonders in keeping your shower clean and humid. Opt for a shower curtain to prevent mildew from forming as a result of improper heating and drying methods..
(I)