Implications of the Natural Order Hypothesis:
Krashen observed that learners acquire grammatical structures in a predictable order (e.g., learning -ing before third-person -s), regardless of their L1 or teaching method.

Why correction fails here:

If a learner is not at the stage to acquire a specific rule (e.g., they are at Step 2 and you correct a Step 4 error), the correction will not "stick" in the acquired system.
They might learn it consciously (for a test), but they will revert to the error in natural speech until they are naturally ready for that stage.

Thus, Option C is the correct pedagogical implication: heavy reliance on drilling order is futile; exposure is key.

Learning and Acquisition

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