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Each year companies in the 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 : annually by preventing illness among employees and gain as much as $200 billion through improving performance of workers if they simply provided 
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
Can anyone help me rule out D ?   Highly appreciated
Offical answer is E
							