Answer: Option (c) is the correct answer.
Step-by-step explanation:
If a substance completely dissolves in water and results in the formation of a clear solution then it means the substance is soluble in water.
For example, dish washing detergent, and drink mix are both soluble in water.
Whereas if a substance at all does not dissolve in water then we are able to see particles of the substance into the water. This substance is known as water insoluble substance.
For example, cloth, plastic, sand, and copper are all insoluble in water.
Thus, we can conclude that Greg's table is incorrect because sand is insoluble in water.