Concept:Comprehensible input is a key idea in Stephen Krashen's theory of second language acquisition. It describes language that learners can understand even though it is slightly above their current level.
Explanation:Krashen proposed that language is acquired when the input is meaningful and just a little beyond what the learner already knows.
The input must be understood, not just repeated.
This slightly advanced input helps learners naturally improve their communication and comprehension skills.
If the input is too easy, no new learning happens. If too hard, it cannot be understood.
Thus, comprehensible input is always slightly above the learner's current mastery level.
Answer:C. meaningful oral and written language slightly above the learner's current level of mastery.