阅读下列短文, 从给的四个选项 (a、b、c和d) 中, 选出最佳选项。
the question of what children learn, and how they should learn, is continually being debated and redebated. nobody dares any longer to defend the old system, the learning of lessons parrot-fashion, the grammar-with-a-whip system, which was good enough for our grandparents. the theories of modem psy