Why is the main advantage of a long liner brush reduced when it is held too tightly?

Correct answer: Flowing flexible movement becomes restricted

A long liner brush is valued for producing flowing, continuous lines through the flexibility of its long hairs and the movement of the hand and wrist. A tight grip restricts that movement, making the brush drag or produce a stiff, broken line. Therefore option B is correct. Grip pressure does not rename the colour, increase water capacity or automatically make the line transparent; a relaxed but controlled hold is preferable.