Answer: the combination "sugar and water" will form a solution.
Step-by-step explanation:
The question requires us to determine which of the combinations given will form a solution.
To solve this question, let's consider this definition of solution: a homogenous mixture of two or more substances in relative amounts. This means that, to be considered a solution, two mixed substances must form a homogeneous mixture, i.e., without separation of phases.
Considering the options given by the question, we can say:
- oil and water do not mix (because they have different polarities), and separate in different phases when are put together;
- sand and water do not form a homogeneous mixture: sand is deposited at the bottom of the vessel and forms a separated phase of solid;
- sugar and water can form a homogeneous mixture, therefore they form a solution;
- sand and sugar form visible separated phases when mixed together (we can see the particles of sugar and sand separated).
Therefore, considering the points above, we can say that only sugar and water form a solution.