Answer:
correct option d. gum arabic
Step-by-step explanation:
solution
we know for watercolor creating water is need to be mixing with gum arabic
because it mix very easily in water so as gum arabic is use as binder for painting watercolor
and Pigment of color is suspend with in acacia gum that varying amount and result in watercolor paint
The gum arabic is water soluble
so by add water the pigment to release in to the water
so that create watercolour painting we need water is mix with gum arabic
so correct option d. gum arabic