Concept:A language textbook should provide comprehensible input through engaging and accessible material.
Explanation:The main goal is to make learning effective and student-friendly.
Thus, a good textbook must have attractive fonts, clear illustrations, and learner-friendly texts.
These features help students understand content easily and stay interested.
While interesting stories are valuable, at the upper primary level the emphasis should be on visual appeal and readability.
Answer:D. attractive fonts, illustrations and learner-friendly texts