alleryAccording to Krashen, which input moves a learner forward?
AAlready mastered and easy
BUnderstood and a step ahead
CFar too hard for the learner
DHeard but not understood
Answer & Solution
Correct answer: B. Understood and a step ahead
1. The input hypothesis says progress comes from understanding input that contains i+1.
2. Input already mastered (i) adds nothing new, and input far above the learner cannot be understood.
3. Input that is not understood gives no acquisition at all, because comprehension is the key.
4. So the best input is comprehensible and just a step beyond the present level.
**Why not the others:** Easy material teaches nothing new, and material that is far above the learner or not understood fails the comprehensibility condition.
_Source: Wikipedia, "Input hypothesis", section "Input hypothesis" (revision 1380165607)_
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