What can be an initial correction if a backrun begins to form?

Correct answer: Lift excess water with a clean, lightly damp brush

When a backrun is just beginning, the immediate goal is to reduce the excess moisture that is driving pigment outward. A clean, lightly damp or ‘thirsty’ brush can touch the pooled water and lift it without adding another wet source. This may limit spreading, although the result depends on timing and paper condition. Adding more water usually enlarges the bloom, black paint hides rather than corrects it, and folding the paper damages the surface. Hence option B is best.