ActivityLifecycle callbacks A →B and B →A

What Happens when you launch Activity B from A and come back to A by pressing the back button

Suppose you are having one more activity called C If you kill Activity C from task manager so

onDestroy(C) →onDestroy(A) →onDestroy(B)

Launching Activity A from Activity A itself

onPause(PreviusInstance) →onCreate() →onStart() →onResume() →onStop(PreviusInstance)