Spanish guitarist and composer Andres Segovia led the twentieth-century revival of the classical guitar, which was not considered sufficiently prestigious enough to be a concert instrument.

The paramount question is whether we take “consider to be” as unidiomatic. If that were so, we have to chuck out choices A, B and D and choose between C and E. C is a blatant fragment. So E must be the final choice. If on the contrary, we decided to pardon the idiomatic gaffe of consider to be, then Choice D looks very promising.

A) Segovia led the twentieth-century revival of the classical guitar, which was not considered sufficiently prestigious enough to be ---- two errors; sufficiently and enough are redundant; not worthwhile

B) Segovia, who led the twentieth-century revival of the classical guitar, had not been considered prestigious enough to be -- --- awful change of meaning. This choice compares Segovia, a person, to a concert instrument

C) Segovia, leading the revival of the classical guitar in the twentieth century, not previously considered sufficiently prestigious for --- No verb in the clause. a fragment

D) Segovia led the twentieth-century revival of the classical guitar, which had not previously been considered prestigious enough to be
The timeline sequence is correct since Segovia revived (simple past) an earlier perception, described in a past perfect. But alas: who can reconcile with “consider to be”


E) Segovia had led the revival of the classical guitar in the twentieth century, which was not considered sufficiently prestigious for—I have my reservations about the timeline. The non- prestigiousness seems to follow (in simple past) Segovia’s revival, marked in the past perfect. In addition, we have to now justify the touch rule foul of “which”, saying that the twentieth century is actually an essential modifier of the classical guitar and the real referent is only the guitar.

Well: That is GMAT for you
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I think it's option D because the considered to be is not modifying prestigious enough rather that "to be" is used for defining the concert instrument {position}


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I suppose "considered to be" usage is not appropriate in GMAT

1. I could not understand what you meant by "sufficiently and enough" together. If you clarify this query a bit, then we may discuss further.

2. Correct idiom: Consider X Y - Here "to be" is outside the idiom structure: X = which, Y = prestigious.
Which (X) is considered prestigious(Y) ... usage is alright and in line with the correct idiomatic structure mentioned above.
Another example: I am old enough to be the captain. ("to be" has no bearing with the verb "is")
Similarly,
I consider you old enough to be the captain. ( "to be" has no bearing with the verb"consider")

Your point 2:
No, Guitar is not considered a concert instrument: Guitar is considered prestigious - how much prestigious? enough to be a concert instrument.

There is no difference between my example above and option D except that one is in active voice and the other passive. OK I shall try with another example:

I consider you beautiful. Correct
You are considered beautiful. Correct
I consider you beautiful enough to be the lead actress. Correct
You are considered beautiful enough to be the lead actress. Correct
Now compare:
which is considered prestigious enough to be a concert instrument.

Do you see the point now?

your point 1: Yes, you are right. "sufficiently" and "enough" are both correct in this context. One cannot eliminate answer on the basis of this split: and there is no answer choice, which has been eliminated here because of this split.

Agree option D is the best. But isn't the use of the Past Perfect Tense and previously for the same activity bit redundant?

D) Segovia led the twentieth-century revival of the classical guitar, which had not previously been considered prestigious enough to be