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.

Based on that paragraph can we conclude that this sentence is true?
Varnish removal is even easier for window sills when there is adequate cross ventilation.

OPTIONS:
[a]. Yes;
[b]. It's impossible to say;
[c]. No;
[b].