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Threads doubt

 
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hi ranchers,

Given the code below

public class ThreadDemo extends Thread[
public void run(){
System.out.println("Thread started");
try{
Thread.sleep(20000); //20 seconds sleep
System.out.println("I am Back from my sleep");
}
catch(InterruptedException e){
System.out.println("I got Interrupted");
}
}
}
Which of the following statements are true?

A.Exactly 20 seconds after the start method
is called "I am Back from my sleep" be printed.

B.We can be sure that atleast after 20 seconds elapsed,
"I am Back from sleep" will be printed.

C.The delay between output "Thread started" and "I am Back
from sleep" is less or more than 20 seconds.

D.None of the above.

Answer given: B

Yes, i do agree that B will be correct... but only if there is a main method which starts an instance of ThreadDemo by calling start() ...
here should we assume anything and proceed?

going just by the question i would say option D is the correct answer ... am i right in doing so?
 
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