Final Answer:
The word that should be capitalized in the sentence is:C. dallas
Step-by-step explanation:
In the given sentence, the word that should be capitalized is "C. dallas." Capitalization rules dictate that proper nouns, including the names of specific locations like cities, should always be capitalized to maintain grammatical correctness. Dallas is a proper noun as it refers to a specific city, and capitalizing it adheres to standard language conventions.
Capitalization plays a crucial role in providing clarity and distinguishing proper nouns from common nouns. In this sentence, "Dallas All-Con" is an event held in the city of Dallas, and capitalizing "dallas" ensures that readers recognize it as the name of a specific location. The other options—fiction, fantasy, and conventions—are appropriately capitalized either because they are proper nouns or the first word in a sentence.
Therefore, option C, which is "dallas," is the correct choice for capitalization in this context. Ensuring consistent and accurate capitalization enhances the readability and grammatical correctness of the sentence, aligning with language conventions and facilitating clear communication.