As per Stephen Krashen, 'The effective language teacher is someone who can provide input and help make it _________ in a low anxiety situation.'

Stephen Krashen's Input Hypothesis emphasizes 'comprehensible input' (i+1)—input slightly above the learner's current level but understandable. His Affective Filter Hypothesis adds that learning occurs best in low-anxiety environments. The exact phrasing in Krashen's work refers to making input 'comprehensible' in a low-anxiety setting.