Java error-prone questions (1)

Check the program, whether there is a problem, if there is, point out the problem, if not, explain the output.

public class HelloB extends HelloA 
{
 public HelloB()
 {
 }
 {
     System.out.println("I’m B class");
 }
 static
 {
     System.out.println("static B");
 }
 public static void main(String[] args)
 {
     new HelloB();
 }
}
class HelloA
{
 public HelloA()
 {
 }
 {
     System.out.println("I’m A class");
 }
 static
 {
     System.out.println("static A");
 }
}

A.static A
  I’m A class
  static B
  I’m B class

B.I’m A class
   I’m B class
   static A
   static B

C.static A
   static B
   I’m A class
   I’m B class

D.I’m A class
   static A
   I’m B class
   static B

Answer: C.

Analysis: It involves: static initialization code block, construction code block, and construction method.
When inheritance is involved
, execute in the following order: 1. Execute the static code block of the parent class 
static {
        System.out.println("static A");
    }
Output: static A
2. Execute the static code block of the subclass
static {
        System.out.println("static B");
    }
Output: static B
3. Execute the construction code block of the parent class
{
        System.out.println(" I'm A class");
    }
Output: I'm A class
4. Execute the constructor of the parent class
public HelloA() {
    }
Output: None
5. Execute the construction code block of the sub-class
{
        System.out.println(" I'm B class");
    }
Output: I'm B class
6. Execute the constructor of the subclass
public HelloB() {
    }
Output: None

, the final output is:
static A
static B
I'm A class
I'm B class
Correct Answer: C