by bluebeans Sun Sep 06, 2015 3:23 pm
I also felt inclined to (B) due to the mention of "wetland" in the last line of Passage B.
But if you look at how PsgB mentions the effects of purple loosestrife on wetland vegetation, you notice that he doesn't think it's that big of a deal. PsgB says the real motivation for everyone flipping out is the "economics of exploiting", which is now under threat b/c of a "decline in the production of the wetland resource." In PsgB, the decline of wetland is mentioned matter-of-factly. Sure, there's a decline, but PsgB doesn't really think its a big deal -- instead it mentions the decline only to explain its relationship to the "economics of exploiting".
If answer choice (B) read, "Its establishment.... has had an effect" rather than "Its establishment... has had a disastrous effect", then it would've been fine. But does PsgB really think the effect on wetland has been disastrous? Naah.