Final answer:
A proposition cannot be categorized as sound or unsound; this classification applies to arguments. A proposition is a statement that can be true or false, and an argument is sound if it is valid and has all true premises.
Step-by-step explanation:
It is false that a proposition can be categorized as sound or unsound. Rather, these terms more accurately apply to arguments. A proposition is a statement or assertion that expresses a judgment or opinion which can be either true or false. Whether a proposition is true depends on if it aligns with an actual state of affairs or fact. An argument, on the other hand, is said to be sound if it is both valid (the conclusion logically follows from the premises) and if all its premises are true. A proposition refers to the content of an assertion, while soundness refers to the overall strength and truth of an argument, combining its validity and the truth of its premises.