What is the result?

Given:

abstract class C1 {
public C1() { System.out.print(1); }
}
class C2 extends C1 {
public C2() { System.out.print(2); }
}
class C3 extends C2 {
public C3() { System.out.println(3); }
}
public class Ctest {
public static void main(String[] a) { new C3(); }
}

What is the result?

A.
3

B.
23

C.
32

D.
123

E.
321

F.
Compilation fails.

G.
An exception is thrown at runtime.