Answer: It's C
Step-by-step explanation:
A solution is defined as a homogeneous mixture in which solute particles are evenly distributed into the solvent.
A solution is a clear solution whose particles cannot be separated out as they are all present in same state.
On the other hand, a mixture in which particles are unevenly distributed into the solvent is known as a heterogeneous mixture.
For example, sand in water is a heterogeneous mixture.
Particles of a heterogeneous mixture can be separated out generally through filtration. This is because these particles are not present in same state.
Thus, we can conclude that the statement a mixture having a uniform composition where the components can't be seen separately and all components are in the same state, best describes a solution.