What percentage of adult syntax, morphology, and phonology is typically acquired by kindergarten?

The correct answer indicates that by kindergarten, children typically acquire about 90% of the adult syntax, morphology, and phonology. This high percentage reflects the rapid language development that occurs in early childhood. During the preschool years, children are immersed in language-rich environments, which aids in the development of complex sentence structures, understanding of grammatical rules, and pronunciation of sounds.

By the time children enter kindergarten, they have not only built a substantial vocabulary but also learned to use language effectively to communicate their thoughts and needs. While they might still be mastering some nuances and exceptions of language rules, the foundational elements have largely been established, making them proficient in everyday language use. This understanding is critical as it lays the groundwork for further literacy and communication skills that will develop as they progress in their education.

The other percentages do not accurately reflect the typical language acquisition milestones for children by kindergarten and would suggest a lesser degree of proficiency than what is generally observed.