Concept:Metacognition means being aware of one's own thoughts and behaviours. When teachers reflect on their own gender-biased actions, they can actively correct them and create a fair classroom environment.
Explanation:Gender discrimination in schools often stems from unconscious bias. The best way to eliminate it is for teachers to examine their own behaviour. This is called metacognition.
Teachers who understand their biases can then stop favouring one gender over another. Option A (selecting more boys for music) is itself biased and does not avoid discrimination. Option C (equal recruitment of male and female teachers) only affects staff, not students' classroom experience. Option D (making a strict rule) may not work unless teachers’ mindsets change from within.
Thus, the most effective approach is for teachers to become aware of their own gender-biased behaviours and correct them. This internal change is more powerful than external rules or unequal selections.
Answer:The best way to avoid gender discrimination in a school is metacognition of their gender‑biased behaviours by teachers. Correct option: B.