A homogeneous mixture is one that has a uniform composition throughout, meaning the different components are not visibly distinguishable. Among the options provided:
- Salt water is a homogeneous mixture because the salt is fully dissolved in the water, creating a uniform solution.
- A salad is a heterogeneous mixture since the individual ingredients (like lettuce, tomatoes, cucumbers, etc.) are distinct and can be seen separately.
- Orange juice with pulp is also a heterogeneous mixture, as the pulp is suspended in the juice but can still be seen and identified.
Therefore, the correct answer is salt water.