From the words or groups of words lettered A to D, chose the word or group of words that best completes the sentence. You are not sure where you placed the ...

From the words or groups of words lettered A to D, chose the word or group of words that best completes the sentence.
You are not sure where you placed the book....?

Answer Details

The correct option to complete the sentence is "are you." The sentence is in the form of a statement, but it ends with a question mark, indicating an inquiry. The phrase "you are not sure where you placed the book" is a statement, and the phrase "are you" is a question that seeks to clarify or confirm the statement. Therefore, the most appropriate option is "are you," as it is a question that fits the context of the sentence. The other options do not fit the context and are not appropriate for a question seeking clarification.