When a drop of detergent solution is added onto a clean towel, it spreads instead of existing as a droplet. Which of the following statements describes this phenomenon?

1. Detergent acts as an emulsifying agent.
2. Detergent reduces the viscosity of water.
3. Detergent reduces the density of water.
4. Detergent reduces surface tension of water.

Submitted by :- Muhammad Nawaz