The incidence of rape in rural areas

[Vincen]

The incidence of rape in rural areas is equally high or more so than in urban areas.

(A) equally high or more so than in urban areas
(B) equal to or higher than in urban areas
(C) as high as in urban areas or more
(D) equal to, if not more, than in urban areas
(E) as high as it is in urban areas, if not higher

The OA is E.

Why options B and C are not correct? What is wrong with them.