Which solution is a homogeneous mixture?

A homogenous mixture is a mixture that contains a single phase

Explanation:

In the physical sciences, a phase is a region of space, throughout which all physical properties of a material are essentially uniform. Hence when we refer to a phase we mean a region of entirely homogeneous composition.

A solution of ethanol in water constitutes a single phase, only the liquid can be seen. This is a typical example of a homogeneous mixture.