Which action is correct for making a brush stroke start thick and end thin?

Correct answer: Apply pressure at the start and gradually lift the brush

The governing concept is pressure control. At the beginning, pressing the brush spreads its bristles and deposits a wider mark; gradually reducing pressure and lifting the brush narrows the contact area, producing a tapered ending. Option A is correct. Equal pressure keeps the width more constant, while reversing the grip or adding water does not directly create this thick-to-thin form.