Concept:Soap is a surfactant and heat lowers the surface tension of oil, making grease easier to wash away.
Explanation:Soap molecules have one end attracted to water and the other attracted to oil.
This allows soap to surround oil droplets and lift them off the dish.
Soap reduces the surface tension between oil and water, forming an emulsion.
Hot water further reduces the surface tension and viscosity of oil.
As a result, the oil spreads out and is rinsed away more easily.
Answer:B. Soap and heat decrease the surface tension of oil