Abeam of light passes though a liquid in a test tube without scattering. which type of mixture is most likely in the test tube? a.) colloid b.) emulsion c.) solution d.) suspension

The answer would be letter C - solution.

A mixture should be homogeneous for a light not to be scattered. This is because particles are distributed evenly throughout the mixture which allows light to pass directly. In your choices, the solution allows a  beam of light to pass through a liquid in a test tube without scattering.