You are given a solution of sugar and sand in water. your task is to separate the sugar from the sand. which of the following experimental designs would you choose ?

Option A) filter the sand

Explanation:

When mixing sand and sugar with water, the sand stands in suspention and the sugar disolves because of its high solubility in water.

You can't filter  out the sugar with traditional methods, and if you use for example reverse osmosis you will have water in one side and still a mixture of sand and sugar in the other. So option B) is not possible

If wait for both componets to settle down, that may never happen. The sugar will remain in solution. So option C) is discarded  

Using a magnet has no effect because both elements are non-ferrous, so option D) is also discarded.

At last, you can filter the sand like option A), then evaporate the water from the solution with the sugar and you will have sugar and sand separated.