D - 'Like a house that a child might have constructed from cards' is the best option to indicate what the word 'ramshackle' means.
Ramshackle means something in severe disrepair (example: an old, rusty car is a ramshackle car or this house). A house that a child constructed from cards is also thought to be not sturdy and in need of repair when it comes down.
Probably b, it seems to be the only one with an interaction. D is also technically one but in a negative way
I believe the answer is: italians take over and change white and black cultural traditions
The author make a reference on the migration of italian citizens to united states (mostly new york and chicago). The italian immigrants brought a mafia culture to united states which back than were in a fight for dominance for black and white culture.
Technology. Technological innovation represents the central source of society's problems in Fahrenheit 451. Throughout the book, Bradbury treats technology as inherently anesthetizing and destructive. In the prehistory of the novel, technology played an important role in the social decline of reading.