What educational benefit is shown when the old school teacher teaches the same lesson to children?

Correct answer: The possibility of shared discussion and mutual learning

The governing concept is collaborative learning. When children receive a common lesson in the same classroom, they can listen to one another, ask questions, compare interpretations, correct mistakes, and learn through discussion. The teacher can guide this exchange and make the class a social learning community rather than a collection of isolated pupils. Thus option A is correct: a shared lesson creates the possibility of discussion and mutual learning. Option B belongs to the impersonal, machine-based system criticised by the story. Option C is the opposite of a shared classroom, and option D is unrelated because studying one common lesson does not eliminate other subjects. The educational benefit lies in interaction and cooperation.