单项选择题

类Test定义如下,将下列哪个方法插入行③处是不合法的    ① public class Test {    ②   public float Method(float a,float b) { }    ③    ④ }

A.public float Method(float a,float b,float c) { }
B.public float Method(float c,float d){ }
C.public int Method(int a,int b){ }
D.private float Method(int a,int b,int c){ }