A proposition is the content of a declarative sentence that can be evaluated in terms of truth or falsity. Logical relations like implication, equivalence and contradiction are defined between propositions. Arguments are built out of propositions serving as premises and conclusions. Therefore the truth-evaluable statement described in the stem is known as a proposition.
Option A:
Option A, question, requests information and is not normally judged as true or false. While a question may presuppose propositions, it is not itself a proposition in standard logical usage. Hence question is not the correct term here.
Option B:
Option B, command, directs someone to perform an action and likewise does not have a truth value in the ordinary logical sense. Imperatives can be obeyed or disobeyed but not properly called true or false. Thus command does not match the description.
Option C:
Option C is correct because proposition is precisely the technical term for a statement that can be true or false. Propositions are the basic objects that logic studies in order to examine validity and soundness of reasoning. This makes proposition the appropriate answer.
Option D:
Option D, greeting, such as saying hello, serves a social function rather than asserting a fact about the world. Greetings are therefore outside the domain of truth-valued discourse. Consequently greeting cannot be the correct choice.
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