Which of the following is NOT one of Krashen's five hypotheses?

• A. Monitor Hypothesis
• B. Acquisition-Learning Hypothesis
• C. Interlanguage Hypothesis
• D. Affective Filter Hypothesis

Answer: (C)

Krashen's framework centers on five hypotheses about how language develops in learners. These ideas cover the distinction between acquiring language vs. learning rules, how learners use their internal editor, the idea that grammar is absorbed in a predictable order, the role of comprehensible input just above current ability, and how emotions can affect language learning. The option that is not part of these is Interlanguage, a concept from another SLA theory that describes the learner’s evolving internal system as they progress toward the target language. Interlanguage is a broader idea about temporary linguistic systems, but it isn’t one of Krashen’s five hypotheses.