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hsk013 - That's a forced parallelism. Look at the meaning issue.
In option E, If you add the word 'improved' with all the parallel elements, it would say "...improved reduced the ....", which is not correct.
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hsk013

A difference that you're missing is that option D closes out the first list (X, Y, *and* Z) before moving on. This is absolutely essential, and it's a common theme in SC. You can't mix a second parallel verb into the list of objects for the first verb. In general, you always have to close out any list before moving on to other elements of the sentence (unless they are modifying an item in the list).
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