Which one of the following statements is NOT true of language learning?

Which combination of the following statements affirms the standard principles of language teaching and learning? (i) Comprehension abilities generally precede productive skills in learning a language. (ii) Skills acquired through listening can transfer to other language skills. (iii) Language teaching should emphasize meaning rather than mere grammatical form. (iv) Language teaching is entirely free from environmental effects.

Which principle of Language Learning requires an initial oral approach with emphasis on audio-lingual skills followed by reading and writing?