The sentence that uses a hyphen correctly is:
"The oval-shaped weight dropped to the floor with a crash."
Explanation:
1. In this sentence, the hyphen is used correctly to connect the words "oval" and "shaped" to form the compound adjective "oval-shaped." This hyphen is necessary because it helps clarify that the weight is specifically shaped like an oval.
2. By using the hyphen correctly, the sentence effectively conveys the description of the weight, enhancing the reader's understanding of its physical appearance.
Therefore, this sentence demonstrates the correct use of a hyphen to create a compound adjective.