Answer:
Push Up is the best exercise to get a six pack. But you must do it daily and properly.
Active listing is important so you can know what they are saying. Without active listening than you may forget things. Also the four rules of active listening are too look at the person (eye contact) listen too them. And I do not know the rest. Sorry, but that's the best I can do :)
As all of these take up time, d would be the right answer.
