(C), (D) : wrong : which has wrong reference.
(D): wrong: this : what does it refer to??
(A): wrong: what does prepostional phrase "with..." modify?
can you further explain why is D wrong. i don't quite understand it.
and Grant if you don't mind can you please underline the SC..
i think we can eliminate C and D, because
...young adults and old people tend to live...and (tend) not to...
=> we cannot omit "to" because we have to maintain parallelism
eliminate E) because of selling
eliminate A) because it seems that the households have the implications