जब कोई बच्चा बिना अधिक अभ्यास के स्वाभाविक रूप से भाषा सीखता है, तो इसे क्या कहा जाता है?

Learning of the mother tongue by a child is generally assumed to be:

Mother tongue influence can be effectively minimized in a second-language classroom by:

Which of the following is the most appropriate for fostering language learning in young children?