求助GWD上的一道语法题~~

紫诺

Building large new hospitals in the bistate area would constitute a wasteful use of resources, on the basis of avoidance of duplicated facilities alone.

A.on the basis of avoidance of duplicated facilities alone

B.on the grounds of avoiding duplicated facilities alone

C.solely in that duplicated facilities should be avoided

D.while the duplication of facilities should be avoided

E.if only because the duplication of facilities should be avoided
答案是E，怎么不明白啊.....