A cup of black coffee is a homogenous mixture.
Answer: Option C
Step-by-step explanation:
The mixture in which the solvent and solution present cannot be distinguished from one another as they are uniformly distributed and it is called as homogenous mixture.
In case of heterogeneous mixture it is very easy to identify the component present in it. Among the mixtures given in the options, a cup of black coffee is homogenous mixture as the components present are not differentiated.