The correct answer is A) decreases surface tension of water Surface Tension Water molecules are attracted to each other due to cohesive forces. At the surface of the water, there's an imbalance of force because there are no water molecules above to create attraction. This results in a net inward force, causing the surface to behave like a stretched membrane - this is surface tension. Effect of Soap Soap molecules have a hydrophilic (water-loving) head and a hydrophobic (water hating) tail. Effect of Soap Soap molecules have a hydrophilic (water-loving) head and a hydrophobic (water hating) tail. When soap is added to water, the hydrophobic tails disrupt the cohesive forces between water molecules at the surface. This reduces the net inward force, decreasing the surface tension. Why it's easier to spray Spraying creates tiny droplets of water, which increases the surface area significantly. High surface tension would require extra energy to overcome the cohesive forces and create those droplets. Soap, by reducing surface tension, makes this process easier, requiring less energy for spraying. The other options are incorrect: B) increases surface tension of water: This would make it harder to spray. C) makes surface tension of water zero: While surfactants reduce surface tension significantly, they don't reduce it to zero. D) increases its density: Density isn't directly related to ease of spraying in this context.