Each year companies in United States could save as much as $58 billion annually by preventing illness among employees and gain as much as $200 billion through improving performance of workers if they simply provided offices with cleaner air.
(A) Same
(B) annually if they prevented employee illness and gain as much as $200 billion through worker performance improved by simply providing
(C) annually in employee illness prevention and gain as much as $200 billion through worker performance improved by simply providing
(D) in employee illness prevention and gain as much as $200 billion through improving performance of workers if they simply provided
(E) by preventing illness among employees and gain as much as $200 billion through improved worker performance if they simply provided
The correct answer is (E) I chose it on the following grounds: -
annually is redundant because the original sentence is started with 'Each year' so (A) (B) & (C) are out. Between (D) & (E) I picked (E) because it is more concise.
Can instructors/someone - shed some more light on the grammatical aspects to choose (E) over other choices, if any.
Thanks