Write the next sentence in the following story.

How to fix a front load washer so that it does not smell with washer fan
Understand what causes the smell to begin with.
It is multiple types of mold (including black mold) growing in the internal drain hose inside your washer where you can't see it.
Understand why it grows there.

Choose your answer from: I. The air pressure is attracted to mold, and there is the foul smell which simply sits in the air. In most vacuums, a wet vacuum will effectively fix the problem.; II. Mold thrives on draining out of the motor; it is soft and easy to place in the ground. It needs to be held up with plumber's caulk clamps.; III. Search " mold growth " and you will see that the biggest problem is high humidity (over 60 %). This chart shows you at what relative humidity mold starts to grow.; IV. There are several articles that show that as soon as the mites start lining the drain pipe and clogging the top pipe, mold blooms. Following these guidelines is a useful first step to make sure your washer needs fixed.;. The answer should be
III.