Answer:
A: I don't want to do that so no
By asking if anyone will find out, you are basically saying yes. When saying I really shouldn't do it, you are not giving a concrete refusal. It also sounds like you maybe want to. When saying your brother wouldn't want to, you are not saying no, just stating something someone else said. A would be most effective since it is a clear and concrete refusal.
<span>The answer which is true concerning stretching techniques is B. you should always stretch before warming up. Stretching is quite important to do before any form of exercise, even the easiest ones, such as warming up, so as to prevent the possibility of hurting your body in any way. This way, your body will be prepared for what is going to happen to it next during the exercises you do.</span>