What advantage is shown by a teacher teaching the same subject to all children in old schools?

Correct answer: Opportunity for shared discussion and common experience

The governing concept is collaborative learning. When one human teacher teaches the same lesson to a group, all children receive a common starting point and can respond to the same questions, examples, and explanations. They may compare answers, help one another, and develop ideas through discussion. Thus option A is correct: a shared lesson creates a common experience and supports social learning. Option B is the opposite of what happens in a classroom. Option C is unrelated because a common lesson does not automatically remove homework. Option D is also incorrect because teaching a shared subject can actually support language development through conversation. The story presents this communal element as an attractive feature of old schools.