Beowulf brings Grendel's Claw
Letter choice B is your answer
Personally, I would say that "The city is so big" best captures life in the city, because it describes how busy the city is, and how everything happens so fast it just rushes by. It explains that even people get lost in the wonder and chaos of the city, disappearing into life.
It limits the options for counterexamples to your statement. Not much evidence can leave holes in your writing that someone who disagrees might use to contradict.