The ball keeps dancing in the water spray at intersections because due to higher velocity of water, pressure becomes higher (B). As the water exits the nozzle at high speed, its kinetic energy increases, resulting in an increase in pressure according to Bernoulli’s principle. This higher pressure around the ball creates a force that propels it and causes it to dance in the spray. Options (A), (C), and (D) are not relevant to the phenomenon described. Surface tension (C) typically refers to the cohesive forces between liquid molecules at the surface, not applicable to the situation. Viscosity (D) relates to a fluid’s resistance to flow, which does not directly influence the ball’s dancing behavior. Therefore, option (B) accurately explains the mechanism behind the ball’s movement in the water spray at intersections.