Which class is called first Activity ,BroadcastReceiver or Service?

Question

I have 3 classes in my App.

1. Class A extends Activity
2. class B extends BroadcastReceiver
3. Class C extends Service. When I run the App. which one of this will be called first, I know android doesn't have a entry point. I am blocking the incoming call in class B , and I am calling the service from activity > this service will call BroadcastReceiver > here is where I block the calls. When I run the code from eclipse to Droid, it is constantly blocking the call, even before I start the App. does any one know the reason. Thank you very much .