Answer: The option that shows the correct capitalization is A. Sergeant Tucker drove his assistant.
Step-by-step explanation: As the capitalization rule states that honorifics should be capitalized when they precede a name, "Sergeant" must be capitalized because it is followed by "Tucker", which is a proper name. Moreover, the initial letter of proper nouns must always be a capital letter; therefore, the "T" in "Tucker" must be capitalized. Finally, as the word "assistant" is only referring to a profession, it should not be capitalized.