भाषा विकास के संबंध में निम्नलिखित में से किसे एक संवेदनशील अवधि (sensitive period) माना जाता है?

Vocabulary growth during pre-school years is largely supported by:

Arrange the following stages of language development in their correct chronological sequence: (K) Production of Sound (L) Recognition of Sound (M) Production of Words and Sentences (N) Use of Written Language (O) Final Stage of Mastery in Language Development