Sentence Correction

Investigations along the Solo river in Indonesia have led some archeologists to debunk the idea of an era in which Homo Erectus had still survived in then Homo Sapiens' inhabited areas.

(A) in which Homo Erectus had still survived in then Homo Sapiens' inhabited areas
(B) in which Homo Erectus still survived in areas inhabited by Homo Sapiens
(C) when Homo Erectus still survived where there were areas inhabited by Homo Sapiens
(D) when Homo Erectus had still survived in current Homo Sapiens areas
(E) when Homo Erectus still survived in areas that were then Homo Sapiens'

Why Option E is not the correct option?

OA B