A.
static void Introduce(string gender=”男”,string name,int age=18){} Introduce(name:”alex”,age:20);
B.
static void Introduce(string name, int age=18,string gender=”男”){} Introduce(age=20, name=”alex”);
C.
static void Introduce(string name, int age=18,string gender=”男”){} Introduce();
D.
static void Introduce(string name, int age=18,string gender=”男”){} Introduce(age:45);