निम्नलिखित में से किस कारक का छात्रों के अधिगम पर सबसे सीधा नकारात्मक प्रभाव पड़ता है?

Students who frequently ask questions in the classroom should be:

Which of the following represents the most valid indicators of effective classroom discipline?

When a teacher ensures the classroom door is always either 'fully open' or 'fully closed' and keeps pathways clear of bags, they are practicing which element of classroom management?