While painting grass all strokes have equal width at the bottom and top. What should be done to create natural pointed tips?

Correct answer: Apply pressure at the base and quickly lift upward

The governing brush-control concept is tapering: pressure determines stroke width, while releasing pressure and lifting the brush narrows the mark. Begin with firm pressure at the base to create a broad grass blade, then move upward and flick the brush away quickly to form a pointed tip. Increasing pressure at the end or pressing throughout makes the tip blunt, and extra paint alone cannot create the required taper. Thus, option D is correct.