D uses a gerund as the subject. It uses “traveling” as the noun. Since traveling is a verb used as a noun in this case, it is a gerund
I would say C. It seems like he is saying that the two have different strategies.
Answer: No it shouldn't
Explanation:
"Unless "city" is part of the name (i.e. "Carson City" or "New York City"), it's not capitalized after the city's name. Even used before (as in "City of"), the capitalization only happens if the title of the city in question actually has that name ("City of London", "City of New York")."
