类Test定义如下(1)public class Test{(2)public float aMethod(float a, float b){ }(3)(4) }将以下哪种方法插入行(3)是不合法的()
A. public float aMethod(float a, float b,float c){ }
B. public float aMethod(float c,float d){ }
C. public int aMethod(int a, int b){ }
D. private float aMethod(int a,int b,int c){ }