The sentence which is punctuated correctly is:
<span>C - "The ambassador's entourage will arrive at half past six," Leah announced.
</span>
Leah's speech is enclosed in quotation marks to emphasize it. The word "ambassador" has a contraction to refer to "entourage" as the word it modifies.
A literary style popular during the Romantic era that emphasized the flawed nature of man and his potential for destruction rather than progress, often through monstrous heroes and/or sympathetic villains.
Gothic literature