question on the usage of "than"

#299 in the grammar questions:

1.        Florida will gain another quarter-million jobs this year alone, many of them in high-paying fields like electronics and banking, making the state’s economy far more diversified than ten years ago.

     (D) such high-paying fields as electronics and banking, making the state’s economy far  more diversified than it was

The answer is (D). If (D) is changed into the following, is it still corret?

    (D') such high-paying fields as electronics and banking, makeing the state's economy far more diversified than