From Source to Tap

Every day, the mere action of turning on a tap to have water flowing freely is often taken for granted. And yet, until the first decades of the last century, taps were not actually commonplace, not even, as one might believe, in richer countries, as water was drawn out of a well or from fountains. And it is still a privilege today if we think about the fact that one out of every four people in the world doesn't have access to drinking water.
But where does our water come from?
And how does it get to our homes? The supply sources are aquifers, streams and rivers, natural lakes or reservoirs created by dams (through which, thanks to the height differences created, it is also possible to produce energy). Our water can be disinfected or undergo purification treatments, sometimes simple, other times complex, depending on the origin and the quality of the water. It is then channeled into a network of underground pipes where it can be stored in tanks, often suspended to guarantee sufficient pressure. Eventually, it reaches our homes through a dense distribution network.
So use it with care: it doesn’t flow out of the tap by magic! It is the result of a long and complex process, involving pipes and plants, continuous quality control, machines, materials and energy (electrical and human!) required to make it ready and safe for you to use.

Solution

The right answer is No 2.