求解一道逻辑题，个人认为答案不对啊（没答案）

肚子肉肉的

A medieval manuscript called L contains all eighteenextant tragedies by the Greek playwright Euripides. Of these, ten called the“select plays,” are accompanied in L by ancient commentaries and also appear inother medieval manuscripts; this group includes some of Euripides’ best-knownworks, including the Medea. The other eight, which appear in alphabeticalorder, without commentary. The Electra is one of the alphabeticals.Which of the following can be reliably concluded on thebasis of the Statements given?A.   Only Euripides’ best-known works areaccompanied by ancient commentaries in extant medieval manuscripts.B.   The select plays are accompanied by ancientcommentaries because they were the best known of Euripides’ works.C.   No commentaries were written aboutEuripides’ Electra in ancient times.D.   Euripides’ Medea never appears inmedieval manuscripts unaccompanied by ancient commentary.E.    Euripides’ Electra does not appearaccompanied by a commentary in any extant medieval manuscript.
答案是E，我就不明白了这个结论是怎么的出来的，！哼！