10. 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 groundof 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

E changes meaning so does D. C is awkward construction. in A on the basis is unidiomatic which leaves B.

OA please

10. 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 groundof 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

this is a tought question
A- On the basis of avoidance is definetly wordy
B- Same with "on the grounds of avoding" actually worst, in GMAT we need to avoid the -ing most of the time
C- I am not too sure of the word "solely" since it indicates this is the only reason at all (kind of extreme, and GMAT is not extreme)
D- provided an alternative that is not stated with "while" example: "I study hard while I am not too confident of my results"
I would go with E