Can we draw the following hypothesis from the context (see options)? 

Context:

How to apply window decals<br>Determine if the conditions are right. You should only apply decals when the weather is mild. Don't try to apply decals when it is extremely cold or hot.

Hypothesis: Make sure the surface is clean before you apply your decal.
Choices: I. Yes. II. It's impossible to say. III. No.