Question

homogeneous mixtures can exist
a only in the gas phase.
b only in the solid phase.
c as liquid, solid, or gas.
d only in the liquid phase.

Explanation:

Homogeneous mixtures have a uniform composition throughout. Examples include air (gas - phase homogeneous mixture), alloys like brass (solid - phase homogeneous mixture), and salt - water solution (liquid - phase homogeneous mixture). So, homogeneous mixtures can exist in liquid, solid, or gas phases.

Answer:

C. as liquid, solid, or gas.