Final answer:
The sentence that uses dashes correctly is option B: "I looked under the bed - can you believe it? - and there it was!" The correct use of dashes in this sentence is to set off a nonessential interruption. By using dashes, the writer adds emphasis and conveys a sense of astonishment.
Step-by-step explanation:
The sentence that uses dashes correctly is option B: I looked under the bed - can you believe it? - and there it was!
The correct use of dashes in this sentence is to set off a nonessential interruption. The dashes create a break in the sentence to emphasize the surprise or disbelief of finding something under the bed.
For example, without the interruption, the sentence would read: "I looked under the bed and there it was." However, by using dashes, the writer adds emphasis and conveys a sense of astonishment.
Learn more about Dashes in a sentence