Why is the grid kept light when using it in a final drawing process?

So it remains a guide but does not dominate the final figure

The governing concept is the functional difference between construction lines and final lines. A grid helps the artist measure proportion, locate features, compare distances, and transfer a drawing accurately. It is a temporary guide rather than the intended subject. Keeping it light allows the artist to see and use the squares while ensuring that the finished contour, details, and main forms remain visually dominant. Therefore, option A is correct. A dark grid could compete with the subject, confuse the viewer, or become difficult to erase without damaging the paper. Option B has no connection with the purpose of a grid. Option C is the opposite of good practice because the main line should remain clear. Option D is also unrelated; grid weight does not automatically make colours incorrect. Light construction marks support accuracy without taking over the composition.

This is a Class 9 Art Education question. Chapter: Elements of Art. Topic: Line.