Which practice can a human teacher make children do in class?

Correct answer: Conversation and discussion

The governing concept is active, interactive learning. A human teacher can ask questions, invite children to explain their ideas, arrange conversation, and guide a class discussion. These activities make learners participate instead of merely receiving programmed answers, and they allow the teacher to correct misunderstandings as they appear. Thus option A is correct. Always practising alone is closer to Margie’s isolated mechanical education and does not use the social value of a classroom. Machine repair is a technical task, not a normal learning practice in this context, while hiding books prevents learning rather than supporting it.