单项选择题

下列程序的输出结果为( )。
public class Reentrant

public synchronized void a()

b();
System.out.println("here I am,in a()");

public synchronized void b()

System.out.println("here I am,in b()");

public static void main(String args[])

Reentrant r=new Reentrant();
r.a();

A.here I am,in a()/here I am,in b()
B.here I am,in b()/here I am,in a()
C.here I am,in a()
D.here I am,in b()