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.
Is this a question or an answer?
Love your neighbor as yourself. Or Love the Lord thy God with all your heart, with all your soul, with all your mind, with all your strength