Which of the following can best describe the tone of the passage

A．how children's thoughts are corrupted by racism as they grow
B．the author's far more miserable experience of being neglected
C．how the black people should unite to fight against the Whites
D．the education of smaller children to behave pleasantly to each other

A．leads to a world with no variety
B．does not see the differences between cultures
C．hinders the world's economic development
D．does not tolerate coexistence of different cultures