How should each stroke be placed relative to the previous stroke for an even fill?

Correct answer: Slightly overlapping

The governing concept is continuous coverage. Each new stroke should slightly overlap the edge of the previous one, creating a connected layer of paint and preventing narrow uncoloured gaps. Option A is correct because controlled overlap produces an even surface. Strokes placed far apart leave paper visible, an opposite direction is not itself a placement rule, and strokes outside the paper cannot fill the intended area. Consistent pressure also improves the result.