What should be done to keep a light area clean beside a dark watercolour area?

Correct answer: Preserve the light area first and apply the dark colour with a controlled edge

The governing concept is planning and preserving highlights in transparent watercolour. Light areas are difficult to restore once dark pigment flows over them, so the artist should reserve the light shape first and then place the darker wash with controlled moisture and a clean edge. Option C describes this sequence. Wet blending and excess water can cause bleeding, while painting everything black destroys the intended light area instead of protecting it.