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