What is the core idea of the comprehensible input hypothesis?

• A. The input must be fully comprehensible with no partial understanding.
• B. L2 is acquired faster when the message is understood, with input just beyond current competence and scaffolding.
• C. Acquisition happens only through translation.
• D. Improvement comes mainly from correction of errors.

Answer: (B)

The main idea is that language growth happens when you understand messages that are just beyond what you can fully understand, with supports that help you bridge the gap. Learning occurs most effectively when the input is comprehensible but carries structures slightly above your current ability (often described as i+1), and you have scaffolding—context, visuals, prior knowledge, and teacher or peer support—that helps you extract meaning and notice patterns. This is why the best choice says that language is acquired faster when the message is understood, with input just beyond current competence and scaffolding.

Input that is completely easy with no challenge isn’t enough to push you toward new grammar. Acquisition through translation isn’t how natural language learning typically happens, and improvement driven mainly by correcting errors isn’t the central mechanism of this idea.