What Exception Type Does the Following Program Throw? Public Class

What exception type does the following program throw? public class Test {
Public static void main(String[] args) {
Object o = null;
System.out.println(o.toString() ) ;
}
}

A) ArrayIndexOutOfBoundsException
B) ClassCastException
C) NullPointerException
D) ArithmeticException
E) StringIndexOutOfBoundsException