Colour spreads too much in the wet-on-wet method. What is the most likely cause?

Correct answer: The paper is excessively wet

The governing concept is water control in the wet-on-wet technique. Paint is applied to a damp surface, so the amount of moisture determines how far the pigment travels. If the paper is excessively wet, the colour loses control and spreads into unwanted areas. Therefore, option A is correct. A clean brush, dark pigment, or a small palette does not by itself cause excessive spreading. Remove extra water and apply paint when the surface is evenly damp.