A circular water bloom formed in the light area while blending wet paint with a clean brush. What was the main cause?

Correct answer: The clean brush contained more water than required

A water bloom occurs when excess clean water enters a still-damp painted area. The water pushes and redistributes the wet pigment toward the edge, leaving a pale centre or ring-like mark as the area dries. Therefore, option D is correct. Brush size, pigment darkness, and an outline do not provide the moisture imbalance needed to create this circular bloom. After rinsing, the brush should be lightly blotted before blending.