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)