Read the text and determine if the sentence is true (see options at the end):

How to remove varnish<br>Create good ventilation. Whether your sanding or using a chemical solvent, it's a good idea to have ventilation. Open windows and use fans to create cross-ventilation if you're inside.

Sentence: Windows cannot be opened.
Options are:
 (A). Yes
 (B). It's impossible to say
 (C). No
(C).