どの

Use どの to ask about a specific choice among a known set of items. It is placed directly before a noun to specify which item you mean, and the listener is expected to identify one from a group. どの is more formal than どのくらい or どれ; it targets a noun, e.g., どの本, どの色. It is commonly used in questions about preferences, options, or requirements (e.g., selecting a book, color, or place). In conversation, どの often appears in questions with ですか/をください/が好きですか, etc.