Final answer:
The correct sentence that uses dashes correctly is option OB: 'I looked under the bed - can you believe it? - and there it was!'
Step-by-step explanation:
The correct sentence that uses dashes correctly is option OB: I looked under the bed - can you believe it? - and there it was!
In this sentence, the dashes are used to indicate a sudden change in the speaker's thoughts or to add extra information. The first dash separates the main clause from the additional exclamation, and the second dash adds emphasis to the surprise of finding something under the bed.
Using dashes in this way helps to maintain the flow of the sentence while providing a brief interruption or sidebar.
Learn more about Proper use of dashes in a sentence