How can you tell if a solution is concentrated

You will often hear a solution referred to as dilute or concentrated. A dilute solution is one that contains a relatively small amount of the solute in a given volume of solvent. Tap water is an example of a dilute solution; it contains very small quantities of dissolved minerals.

Iwould you figure it out but you don't have a picture or in your question as to what the physical property you're looking for is

C) the increase in atmospheric pressure pushes the walls of the balloon outward thus making it  is the answer.hope i you.