What effect is generally produced by applying a new colour on a wet surface?

Correct answer: Soft spreading and blending of colours

In the wet-on-wet method, moisture already present on the surface allows fresh paint to move beyond the immediate brush path. The colours therefore spread into one another and form soft, diffused edges. Option D is correct. A sharp edge is more typical of controlled wet-on-dry work, while wet paint does not harden the paper or prevent spreading.