In a blended background the colour became pale near the main subject because the artist repeatedly used a clean damp brush. What happened?

Correct answer: The brush repeatedly lifted colour and lightened the tone in that area

The governing technique is colour lifting during blending. A clean, damp brush can absorb or loosen previously applied pigment, especially when it is passed repeatedly over the same area. Each stroke removes a little more colour, so the tone near the subject becomes paler and may lose consistency. Option D correctly describes this process; the paper does not create a new colour, and the paint does not turn white automatically.