Sentence Correction

Last year, land values in most parts of the pinelands
rose almost so fast, and in some parts even faster than
what they did outside the pinelands.
(A) so fast, and in some parts even faster than what
they did
(B) so fast, and in some parts even faster than, those
(C) as fast, and in some parts even faster than, those
(D) as fast as, and in some parts even faster than,
those
(E) as fast as, and in some parts even faster than what
they did

stuck between D and E.

OA is D

Any suggestions?