So weird question... I don't agree with any of those answer choices.

a. We don't know and "only" is too extreme.

b. Some of the select plays are Euripides's best known work, so we cannot assume or say with the passage that the whole select plays are the best known work

c. Commentaries might have been written about Electra in ancient times since we cannot assume with the passage that Electra only appears in the medival manuscript called L and that also the L is the only extant medival manuscript.

d. We don't know "never" is too exterme.

e. We don't know anything about other extant medival manuscript.

"Now there is one little step. Notice how the "select plays" differ from "the alphabeticals" in that they are ALSO found in other medieval manuscripts. Therefore the "other eight" are not found in medieval manuscripts ------> Electra does not appear in other ancient manuscripts. The only manuscript it does appear in it is not accompanied by commentary. Thus (E)."

This is explanation of a GMAT instructor from another GMAT website.
I can't see how the bold part makes sense. The passage mentions that the select plays have commentary whereas other other eight don't, but the passage doesn't mention anything that implies the select plays are different from the other eight in that they also found in other medieval manuscripts.

I'd like to hear other people's opinions on this issue.

The statement *does* reference that those "select" plays also appear in other medieval manuscripts.

"Of these, ten called the “select plays,” are accompanied in L by ancient commentaries and also appear in other medieval manuscripts;"

So what it's saying here is that these 10 were so popular they were also captured in other manuscripts out there, not just this "L" one. This "L" happens to also include 8 additional "less known" plays. The "Electra" is a lesser known play and doesn't have commentary as is described since it is among the "8".

We know that the 10 were "also in other manuscripts" => kind of implying that the remaining 8 were not. The 8 did not have commentary and were not as known. Most likely they were not in other manuscripts. So (E) says that Electra does not appear with a commentary in ANY manuscript. Well the only one that it *appears* to be in does NOT have a commentary - so (E) seems to be a valid conclusion. Note (E) mentions the word "appear" so we don't know for sure but it's highly likely based on what we inferred - that it doesn't have commentary in ANY manuscript.
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