问题：

[单选]

Given：  310-025  
Leading the way in IT testing and certification tools， www.testking.com  
- 48 -  
public class foo {  
static String s；  
public static void main （Stringargs） {  
system.out.printIn （“s=” + s）；  
}  
}  
What is the result？（）

A .  The code compiles and “s=” is printed.
B .  The code compiles and “s=null” is printed.
C .  The code does not compile because string s is not initialized.
D .  The code does not compile because string s cannot be referenced.
E .  The code compiles， but a NullPointerException is thrown when toString is called.