Choose your answer: Is "Proto-Slavic, the supposed ancestor language of all Slavic languages, is a descendant of common Proto-Indo-European, via a Balto-Slavic stage in which it developed numerous lexical and morphophonological isoglosses with the Baltic languages." a good answer to the question "Proto-Slavic is a descendant of what?"
Select from: a. yes; b. no;
a.