A vernacular language is a spoken language of a given place, which is not used for official purposes.
In the medieval Europe, the official language - the one found in the books and used at the University- was Latin, so this was the language that was not vernacular.
C - It has its own structure, grammar, and word order
Explanation: Linguists have postulated that this is because the sentence contains some unpronounced -- but cognitively real -- logical variables like x and y.
