Sentence Correction

Despite the repeated warnings against drug abuse and the numerous fatalities, drug use is equally as prevalent, if not more so than, a decade ago.

(A) equally as prevalent, if not more so than, a decade ago.
(B) equally as prevalent, if not more so than, it was a decade ago.
(C) as prevalent, if not more than a decade ago.
(D) as prevalent as, if not more prevalent than, it was a decade ago.
(E) as prevalent, if not more so than a decade ago.

Which of the above Options is the only Option that experts must choose?

OA D[/i]

Hey guys! Does someone have an idea about the right answer? Because I cannot cope with it, but I would like to know it..