Which brush is suitable for painting thin tree branches in watercolour?

Correct answer: Thin pointed brush

The governing concept is brush selection according to the size and control of the mark required. A thin pointed brush holds enough colour while its fine tip produces narrow, controlled lines, so option B is correct for delicate tree branches. A broad flat brush is better for washes and large areas, while a sponge and cloth create irregular textures rather than precise lines. Use moderate water and a light hand for clean branches.