Which combination is useful for soft petal edges and a clear centre in a watercolour flower?

Correct answer: Wet-on-wet for petals and wet-on-dry for the centre

Watercolour techniques are selected according to the edge effect required. Wet-on-wet allows pigment in the petals to merge gently with a damp area, producing soft, diffused edges. Wet-on-dry places colour on a dry surface, so the centre can retain a clearer shape and sharper boundary. Thus option A combines the appropriate methods. Dry brush gives a textured mark, very wet paint everywhere removes control, and clean water alone does not define the centre.