Kuttingchai
Hi
I hope you are aware of the distortion in your examples. Let me point out. I am putting the example you gave originally and the one that you have given now next to next.
Your first example:
Efforts to increase recycling among consumers, a major goal of many American communities throughout the past decade, have not reduced the abundant number of plastic water bottles that has been discarded annually into landfills.
Your second example:
Efforts to increase recycling among consumers, a major goal of many American communities throughout the past decade, has not abundantly reduced the number of plastic water bottles being discarded annually into landfills.
The second example is tatoally different from the first. The first says - have not reduced the abundant number – while the second says – have not abundantly reduced—'Have not reduced' is not even underlined in the first case.
Assuming that you wrongly gave one of the choices as the stem, let me reiterate that D, which according to author is the OA, is awfully wrong . As I said it is the bottles that have been discarded and not the abundant number
Choice E is also a testimony to the very poor quality in saying that --- have not reduced the abundant in—
Something tells me, this is not a professional example. If one is going to depend upon such stuff for his GMAT Prep, we should leave it to him or her to ponder.
Incidentally, I am curious to know where this example has come from.