Waxes that are insoluble in water are soluble in which of the following?

Waxes that are insoluble in water are typically soluble in organic solvents, which include oils, benzene, and ether. This property is due to the hydrophobic nature of waxes, which means they do not mix well with polar solvents like water, but they can dissolve in non-polar or less-polar solvents.

The solvents mentioned in option C—oils, benzene, and ether—are known for their ability to dissolve substances that do not mix well with water, particularly because they share similar chemical characteristics that allow for compatible interactions with wax molecules.

While some of the other options include solvents that can dissolve wax, they are not as comprehensive as the one that includes oils, benzene, and ether. Oils, for instance, are natural solvents for many waxes, while benzene and ether are common organic solvents used in various chemical applications. This highlights why option C is indeed the correct choice for identifying the solvents in which insoluble waxes can dissolve.