Sophia manages a landfill. She decides to measure the rate at which trash increases in volume to fill the landfill as the number of households served increases.

Step-by-step explanation:

If you look at the objects thrown as garbage, it's a two- or three-dimensional item that takes up space and also has mass and this is a solid waste.

And the landfill that dumps such garbage is also three-dimensional.

Hence, the volume module, if the object inside is a solid, either would be

As household numbers rise, landfill space increases.

So,

If H represents the number of household keeps,  then it will be a sufficient unit for the purpose of Sophia that is