Muruga wrote:
Since children who undergo preschool education have been proven to be less liable to need remedial programs later, preschool education programs are demonstrably cost effective.
(A) been proven to be less liable
(B) proved themselves not as liable
(C) proved to be less likely
(D) proven to be less liable
(E) proven themselves not as likely
What is wrong with option "A"? Can someone please explain.
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