Because of skyrocketing land costs in recent times and as public transportation facilities in both private and public domains became vastly improved, many middle income people now switching to suburban localities, which are providing pollution free residential communities at affordable prices.
(A)
(subordinate conjunction) Because of skyrocketing land costs in recent times and
(subordinate conjunction) as public transportation facilities in both private and public domains became vastly improved,
(Main clause expected ) many middle income people
( verb is missing for main clause sentence is FRAGMENTED)(B)
(subordinate conjunction)Because land costs are skyrocketing in recent times and
(subordinate conjunction)as public transportation facilities in both private and public domains are becoming vastly improved,
(Main clause expected ) many middle income people
( verb is missing for main clause sentence is FRAGMENTED)(C) In recent times,
(subordinate conjunction) because of land costs skyrocketing and as public transportation facilities in both private and public domains have become vastly improved,
(Main clause expected ) many middle income people
( verb is missing for main clause sentence is FRAGMENTED)(D)
(subordinate conjunction) While land costs have skyrocketed in recent times and public transportation facilities in both private and public domains have become vastly improved,
(Main clause) many middle income people
are (VERB IS PRESENT) sentence looks ok overall.
(E)
(Prepositional introductory phrase-1) With land costs skyrocketing since recent times and
(Prepositional introductory phrase-2) with public transportation facilities in both private and public domains becoming vastly improved,
(Main clause) many middle income people are
(Meaning error in this option)With X and With Y, many middle income people are now switching to suburban localities.
With is not appropriate to express a reason; object of prepositional phrase do not belongs to middle income people in option E. Thus, Option D is correct.