Why is cleanliness important in the workspace during acrylic painting?

Correct answer: To prevent dust and dirt from sticking to wet paint

The governing concept is protecting a wet paint surface from contamination. Acrylic paint can remain tacky or wet long enough to catch airborne dust, fibres, and other particles. A clean workspace, palette, and tools reduce these unwanted marks and help produce a smoother finish. Cleanliness does not change paint price, canvas weight, or canvas size, so option D is the only relevant reason.