Which is the best topic sentence of the following passage?
Unlike some breeds of dogs, they do not need a lot of exercises every day. Crowds and loud noises do not make them nervous. ¬†Also, they do not mind being alone for hours, if you need to be away at work.¬†On top of all this, they are known to be patient and loving with children. If you are a city-dwelling family looking for a pet, I highly recommend this breed of dog.
A. Greyhounds are a good choice for dog for people who live in cities. B. Every family should have a dog. C. Not all dogs are happy living in the city. D. All breed of dogs are pretty much like -- its all the same.