While the owner of a condominium apartment

[UmangMathur]

While the owner of a condominium apartment has free and clear title to the dwelling, owners of cooperative apartments have shares in a corporation that owns a building and leases apartments to them.
(A) While the owner of a condominium apartment has free and clear title to the dwelling,
(B) The owner of a condominium apartment has free and clear title to the dwelling, but
(C) Whereas owners of condominium apartments have free and clear title to their dwellings,
(D) An owner of a condominium apartment has free and clear title to the dwelling, whereas
(E) Condominium apartment owners have a title to their dwelling that is free and clear, while

Why is choice D wrong.

In one of the posts, I read that we can compare singular to plural, as in this sentence - The consultant in KPMG, who specializes in Finance, differs significantly from the consultants in McKinsey

So, why is choice D wrong.

Expert comments please.

[kartikshah]

Whereas often introduces a thought in the dependent clause that contrasts with something in the main clause.
Examples:

Whereas British Iraq empowered the Sunnis, the Americans would tip the scales in favor of the Shiites. [Wall Street Journal]

The typical prediction was 6500, whereas the index is currently trading at about 5400. [Telegraph]

Whereas 1991 looked completely different from 1971, which in turn could never be confused with 1951, the early nineties are indestinguishable from today. [Boston Globe]