What is the output of the following program code? abstract class C1{ public C1()

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What is the output of the following program code?
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 Test{
public static void main(String[] a){
new C3();
}
}

Options:

A . 12

B . 23

C . 123

D . 321

Answer: Option C

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