原子是由位于中心的原子核和核外电子组成的．原子核带        电，电子带          电，电子是带有最小负电荷的粒子，电量为            ，称为           电荷，常用符号          来表示它。

Which of the following is President Roh Moo-hyun’s argument for relocation of the capital

A．Efficiency of government.

B．Environmental protection.

C．Decentralization.

D．Traffic concerns.