A medieval manuscript called L contains all eighteen extant tragedies by the Greek playwright Euripides. Of these, ten called the "select plays," are accompanied in L by ancient commentaries and also appear in other medieval manuscripts; this group includes some of Euripides' best-known works, including the Medea. The other eight, which appear in alphabetical order, without commentary. The Electra is one of the alphabeticals.

Which of the following can be reliably concluded on the basis of the Statements given?

【选项】The select plays are accompanied by ancient commentaries because they were the best known of Euripides' works.