[单项选择题] 下列程序通过实现Runnable接口创建一个线程，选择正确的语句填入程序的横线处。
class MyRun implements Runnable

String str;
MyRun(String s)

str = s;

public void run()
System.out.println(str);


public class ex40

public static void main(String[] args)

String name = "实现阶段Runnable 接口";
MyRun my = new MyRun(name);
Thread th =
th. start ( );

A. new MyRun(my)
B. new Thread()
C. new Thread(my)
D. Thread(my)