बाल विकास के संदर्भ में, 'ध्वनिविज्ञान' (Phonology) मुख्य रूप से किसे संदर्भित करता 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