Quote:
(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 - the highlighted statement is an independent sentence and two independent sentence cannot be connected using just commas->creates a run on sentence.
Thanks for the comment. Until now, I was thinking that if there is a sub-ordinate conjunction or a FANBOYS with a comma, then it has to join two Independent Clauses. Obviously, the reverse is also true. Thanks for the comment.
Do you have any official examples that have similarly designed options?