On a Chippewa reservation in Wisconsin, young members of the

Question

On a Chippewa reservation in Wisconsin, young members of the tribe are using computers  for learning their ancient language that was nearly forgotten.  

(A) for learning their ancient language that was nearly forgotten

(B) for learning their ancient language that they nearly forgot

(C) to learn their ancient language, which they nearly forgot

(D) to learn their ancient and nearly forgotten language.

(E) to learn their language that was ancient and nearly forgotten

please explain, thank you

Paul · Answer

15 seconds. D it is
A and B are out because idiom is "do X to learn"
D is most concise and best choice.

chunjuwu · Answer

excuse me, 

I would like to know (C) and (E) have any grammer errors? 

or why not C or E

thank you

Paul · Answer

E is just very wordy. D is a shorter version. Remember that conciseness is also part of the GMAT.
C changes the meaning of the sentence. It litterally means that the ancient language was nearly forgotten while the original sentence means  the ancient languange  and  the nearly forgotten language

chunjuwu · Answer

Thanks, Paul. 

You mean that choice C suggests that the language was forgotten by  young members,  while original sentence suggests that the language was nearly forgotten  by people , 
and they are two different meaning, right?

Paul · Answer

Let's have another look at C and I'll try to be clearer.

On a Chippewa reservation in Wisconsin,  young members of the tribe are using computers to learn their ancient language ,  which they nearly forgot .
The italicized portion is a non-restrictive clause, a portion which can be removed, supposedly, without affecting the meaning of the sentence. However, if you remove that portion, the sentence is not as complete as in D. We actually need it to be part of the independent clause(bold) in order to convey that the language was both  ancient   AND   nearly forgotten . D nicely does that and makes those two adjectives as part of the independent clause.
Is it better?

On a Chippewa reservation in Wisconsin, young members of the

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