the other less studied of grammar that is considered distinctive grammar for social languages is ............
a. the rules by which grammatical units like nouns, verbs and clauses which signal characteristic whos-doing-whats-within-discourses
b. the rules by which grammatical units like nouns, verbs and clauses which do not signal characteristic whos-doing-whats-within-discourses
c. the rules by which grammatical units like nouns, verbs and clauses which signal characteristic only of whos-within-discourses
d. the rules by which grammatical units like nouns, verbs and clauses which signal characteristic whats -within-discourses