Final answer:
The correct sentence is option D, which correctly matches subject-verb agreement, uses the proper tense, and includes correct punctuation for dialogue.
Step-by-step explanation:
The correct sentence is option D: “Is this the style of glasses you were considering?” the optician asked Nathaniel. This sentence is written correctly because it uses the singular form “Is this” to agree with the singular subject “style”, the past tense verb “were” to agree with the plural pronoun “you”, and proper punctuation by placing the question mark inside the quotation marks and correctly attributing the dialogue to the optician.
The other sentences contain grammatical errors. Sentences A and C incorrectly use “Is these”, which should be “Are these”, and “was” instead of “were”. Sentence B is incorrect because it lacks the proper punctuation to indicate direct speech.
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