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【单选题】
阅读和理解下面程序段： class Manager extends Employee{ public Manager(String n，double s，int year，int month，int day){ super(n，s，year，month，day)； bonus=0； } public double getSalary(){ double baseSalary-super．gerSalary()； return baseSalary+bonus； } public void setBonus(double b){bonus=b； ) private double bonus； } Manager是Employee的子类，其理由是( )。A.
Manager的适用范围较宽
B.
extends关键字声明
C.
Manager的域减小了
D.
雇员是一个经理
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