From Margie's viewpoint, how does the absence of human teachers make the future ironic?

The future is technologically advanced but learning is less joyful

The governing concept is irony: the future possesses advanced technology, yet that technology does not produce a happier or more meaningful educational experience. Margie’s mechanical teacher can display lessons, test her, and assign work, but it cannot replace the warmth, spontaneity, and companionship of a human classroom. She becomes interested in the old schools because children once learned together under a human teacher and apparently enjoyed the experience more. Option C therefore expresses the irony most accurately. Option A reverses the situation, option B is not the central contrast, and option D is factually unsuitable because future schools still contain lessons. The unexpected result is that progress in machinery accompanies a loss of joy.

This is a Class 9 English question. Chapter: The Fun They Had. Topic: the importance of human teachers.