Which technique can create a yellow-to-orange transition in a sunset sky?

Correct answer: Blending

The governing concept is a gradual colour transition. Blending softens the meeting area between two adjacent colours so that yellow changes progressively into orange instead of ending in a hard boundary. Option A is correct because gentle, overlapping strokes or a suitably damp brush can merge the values. Stippling creates a dotted texture, outlining defines edges, and paper cutting changes the surface rather than producing a painted transition.