Which sentence could best be added after sentence 7?

(7) Downtown food carts are also inexpensive alternatives for employees on their lunch breaks.
A.
A hot lunch can be bought from a food stall or cart at a fraction of the cost of a restaurant meal.
B.
Food vendors in big cities typically make an average of $14,000 to $16,000 a year.
C.
Vendors who are new to a street must be careful not to tread on an established vendor's turf.
D.
Paris is known for having high-quality street artists selling their paintings on the sidewalks.