How will a stroke appear if the brush contains too much water and very little paint?

Correct answer: Light and transparent

In watercolour, the visible strength of a stroke depends largely on the ratio of pigment to water. Excess water carries only a small amount of pigment, so the colour concentration falls and the mark becomes pale, transparent, and less opaque. Option D is correct. A dark opaque stroke requires more pigment and relatively less water; dilution does not make a stroke thick and dry.