60. Based on the information in this passage, it can be inferred that--
(A) An important tenet of structural linguistics was that the primary medium of language is oral.
(B) The higher-level systems of phrases, clauses and sentences had a priority in language teaching.
(C) A language existed principally as symbols written on paper and what is spoken is secondary.
(D) The reaction against traditional grammar was promoted by the movement toward positivismand empiricism.