The correct answer is C.
If siblings explained the use of technology and media to each other the outcome expected would be that the siblings would spend time using technology tools together. They would each know how to use the media and technology, they would probably use them at the same time, they might game together, they would interact together and help each other out.
The third option. Long period of uninterrupted low or moderate intensity physical activity.
The abiltiy to do things with you body that most people cant, such as bending your back without breaking it