In the late 1880s, the journalist Jacob Riis visited tenement dwellings in several impoverished New York City neighborhoods to investigate housing conditions and photograph tenants' apartments, whose interiors were inhumanely overcrowded, their floors often serving as beds, and their walls often windowless and dilapidated with age and neglect.

A) whose interiors were inhumanely overcrowded, their floors often serving as beds, and their walls often windowless and dilapidated with age and neglect

B) whose interiors were inhumanely overcrowded, their floors were often serving as beds, and their walls were often lacking windows and dilapidated due to age and neglect

C) whose interiors were inhumanely overcrowded, their floors were often serving as beds, and they had walls often windowless and dilapidated with age and neglect

D) having interiors inhumanely overcrowded, their floors often serving for beds, and their walls were often windowless and dilapidated due to age and neglect

E) having interiors that were inhumanely overcrowded, their floors often serving as beds, and their walls often lacked windows and were dilapidated on account of age and neglect

[spoiler]OA is A. Whether A has a pronoun error - I believe WHOSE literally modifies APARTMENTS (since directly follows them), rather than tenants?[/spoiler]