Question

if a clear liquid is mixed with a green liquid and no noticeable changes are observed, the most appropriate observation would be

no reaction occurred
the result was a green liquid and no observable changes occurred
the clear reactant turned green

Explanation:

When observing a chemical or physical mixing process, we report what we directly see. Saying "no reaction occurred" is an assumption (we can't be sure at the observation level if a non - visible reaction happened). "The clear reactant turned green" implies a change in the clear liquid only, which isn't accurate as we mixed two liquids. The most accurate observation is stating the result (a green liquid) and that no observable changes (like color change beyond mixing, precipitation etc.) occurred.

Answer:

the result was a green liquid and no observable changes occurred