Since the discovery of the Tufted Badger and other species in the ecos

Question

Since the discovery of the Tufted Badger and other species in the ecosystems outside Vancouver, the number of riparian mammals in the Pacific Northwest has increased considerably.

(A) Since the discovery of the Tufted Badger and other species in the ecosystems outside Vancouver, the number of riparian mammals

(B) Since the Tufted Badger and other species in the ecosystems outside Vancouver have been discovered, the number of riparian mammals

(C) Because the Tufted Badger and other species in the ecosystems outside Vancouver have been discovered, the total riparian mammal number

(D) With the discovery of the Tufted Badger and other species in the ecosystems outside Vancouver, the number of known riparian mammals

(E) With the discovery of the Tufted Badger, as well as other species, in the ecosystems outside Vancouver, the number of riparian mammals

On the GMAT SC, logic is at least as important as grammar: if an answer choice is 100% grammatically correct but logically flawed, it is wrong. The GMAT SC questions present quite a wide variety of logical splits. For a detailed discussion, as well as the OE for this particular question, see:
Logical Splits on GMAT Sentence Correction

Mike :-)

mikemcgarry · Accepted Answer

Dear Jat , I see that Nick90 already gave an intelilgent answer to your question. My friend, I will point out that in the original post, I provided a link, noting that the OE I had written was at this link. Then you posted next, asking for an OE. You were asking for what was already provided. My friend, do you see how your course of action on this question could be interpreted as demonstrating a lack of responsibility for your own success? I am pointing this out because I want to see you be as successful as possible. Excellence on the GMAT is achieved only by those folks who take deep responsibility for their own performance, who are alacritous in exploring every possibility for advancement. Many students labor under the misapprehension that "education" is something that teachers & tutors & expert do to them, and they mistakenly assume a passive role in the learning process. In fact, education is something you do by yourself, for yourself, and on your own. Teachers & tutors & experts are more than happy to provide support, but your learning process is 100% your responsibility. My friend, many students do not realize this and then do not understand why they are disappointed with their eventual results. Your success is directly dependent on your ability to assume powerful and mature initiative in your learning process. If you can bring a high degree of excellence to every step of your learning, your chances for an excellent performance on the GMAT increase considerably. That is exactly what I want for you, my friend. :-)

Does all this make sense? Mike :-)

Nick90 · Answer

This question checks the logic ... " the number of riparian mammals " vs " the number of known riparian mammals "

Because Gmat prefers less ambiguous and more particular answers, D is right answer .

Please give me kudos, if this explanation is helpful to you.

Sent from my Le X507 using  GMAT Club Forum mobile app

Jat · Answer

Could you please explain why D is the right answer ?

Posted from my mobile device

aditya8062 · Answer

D is indeed the correct answer :  With the discovery of the Tufted Badger and other species in the ecosystems outside Vancouver, the number of known riparian mammals

REASONING: the intent of this sentence is to convey that the KNOWN number of riparian mammals has INCREASED. please note that there is NO CAUSALITY in the TWO EVENTS that are mentioned. The "Tufted Badger and other species" WERE ALREADY there in nature BUT it is just that they were NOT REGISTERED as "riparian mammals" EARLIER.

"SINCE" in option A gives a notion of TIMELINE--->this is not intended 
"SINCE" in option B gives a notion of CAUSALITY---> not intended
"BECAUSE" in option C gives a notion of CAUSALITY ---->not intended

leanhdung · Answer

Since the discovery of the Tufted Badger and other species in the ecosystems outside Vancouver, the number of riparian mammals  in the Pacific Northwest has increased considerably.

(A)  Since  the discovery of the Tufted Badger and other species in the ecosystems outside Vancouver, the number of riparian mammals

(B) Since the Tufted Badger and other species in the ecosystems outside Vancouver  have been  discovered, the number of riparian mammals

(C) Because the Tufted Badger and other species in the ecosystems outside Vancouver  have been  discovered, the total riparian mammal number

(D) With the discovery of the Tufted Badger and other species in the ecosystems outside Vancouver, the number of known riparian mammals

(E) With the discovery of the Tufted Badger , as well as  other species ,  in the ecosystems outside Vancouver, the number of riparian mammals

Mahmud6 · Answer

Very esoteric insight. Good learning for us.

Posted from my mobile device

temartemm · Answer

mikemcgarry  could you please explain why in similar Magoosh question below the answer choice including "with" is not right but here we see that such structure can work

As foreign-language learning moves online, the paradigm that, to speak a foreign language, we need to converse with a native speaker is becoming swiftly obsolete.

A) As foreign-language learning moves online, the paradigm that, to speak a foreign language, we need to converse with a native speaker is becoming
B) With the learning of a foreign language moving online, the paradigm that we need to converse with a native speaker to speak a foreign language becomes
C) With foreign-language learning moving online, conversing with a native speaker to speak a foreign language, which is the paradigm, is becoming
D) Because the learning of a foreign language moves online, the need to converse with a native speaker to speak a foreign language is the paradigm, which has become
E) As foreign-language learning moves online, the paradigm, which is we need a native speaker in order to speak a foreign language, has become

gvij2017 · Answer

I have a doubt here.

According to you, B indicates causality which is not intended here by author of original statement. 
But when I asked a question-"why did number increased", the answer comes out- " since many others have been discovered". 
In that way it represent causality.

So can you elaborate how you stuck out B while considering contenders B and D.

richirish · Answer

Meaning.. meaning..meaning. If you understand the meaning, it is a 30 second question.

Number of riparian mammals is not equal to the total number of mammals in the forest.

VerbalBot · Answer

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Since the discovery of the Tufted Badger and other species in the ecos

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Since the discovery of the Tufted Badger and other species in the ecos

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