Which condition justifies using a colon to introduce a list?

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A colon introduces a list only when the material before it is a complete sentence that could stand on its own. In other words, you’re listing items that explain or complete a full thought already stated. For example, “You need three items: a notebook, a pencil, and a ruler.” The part before the colon is a complete sentence, and the colon signals that what follows are the items you need.

The other options fail because they don’t provide a standalone, complete thought before the list. A dependent clause isn’t a complete sentence, so it can’t properly introduce a list with a colon. A lone verb or a fragment also doesn’t form a complete thought, so it can’t justify a colon. A question can be a complete sentence, but the standard rule emphasizes a preceding independent clause that presents a complete idea to be expanded by the list.