Which theory describes a period of growth during which full native competence is possible when acquiring a language?

• A. Critical Period Hypothesis
• B. De-contextualised Language
• C. Deductive Approach
• D. Descriptive Grammar

Answer: (A)

Language development is most successful when there is a window in early life during which the brain is especially receptive to language input, allowing a learner to reach native-like proficiency with rich exposure. This idea is captured by the Critical Period Hypothesis, which posits heightened neural plasticity in early childhood that makes full native competence more attainable. After this period, language learning becomes more challenging, and achieving native-like fluency—especially in pronunciation and grammar—tends to decline, even with continued exposure. This theory contrasts with other terms that describe different concepts: de-contextualised language focuses on language outside real context, a deductive approach is about explicit rule-based teaching methods, and descriptive grammar studies how language is actually used rather than modeling a time-bound growth phase. In short, the concept described by the question is the Critical Period Hypothesis, the idea of a developmental window where native-like language attainment is most possible.