A syrup is primarily distinguished from other types of solutions by the:

While syrups may contain active ingredients, this term is too broad and can apply to various types of solutions, not just syrups. Many solutions may have active ingredients that define their purpose, but it is the high sugar content that specifically distinguishes syrup as a type of solution.

An unpleasant aftertaste is not a defining feature of syrup. In fact, most syrups are designed to have a pleasant taste due to their high sugar content. This characteristic does not apply universally to all syrups, making it an unreliable criterion for distinguishing them from other solutions.

The presence of alcohol can be found in some syrups, particularly those used in cooking or for medicinal purposes, but it is not a universal characteristic of all syrups. Many syrups, especially those used in beverages or desserts, do not contain alcohol at all, making this choice not applicable for defining syrup in general.