The correct answer is option 4. Surfactant molecules in soaps and detergents help to clean dirty clothes by forming aggregates and removing dirt in the core of these aggregates.

Surfactants are molecules that have a hydrophobic (water-fearing) region and a hydrophilic (water-loving) region. When soap or detergent is added to water, the hydrophilic region of the surfactant molecules attracts water molecules, while the hydrophobic region repels them. This creates structures called micelles, where the hydrophobic ends of the surfactant molecules are aligned at the center of the micelle, while the hydrophilic ends face outwards towards the water.

When dirty clothes are soaked in soapy water, the hydrophobic ends of the surfactant molecules in the micelles attract the dirt particles, which are typically oily or greasy in nature. The surfactant molecules then surround the dirt particles, forming aggregates called micelles. As the micelles are constantly moving around in the water, they can easily lift and suspend the dirt particles away from the cloth.

So, the correct answer is option 4 because surfactant molecules form aggregates (micelles) that trap and remove dirt from clothes by keeping it in