You use SOS too? I believe the answer was the topic? I don't remember too well.
Answer:
i believe A would be the best conclusion
Explanation:
The sibling tries to warn their brother that skateboarding isn't as easy as it is in the video games, but the brother doesnt listen. It would make sense (to me) that the conclusion would be A.
hope this helps :)
I. modest (if the question is what would fit best in the underlined portion)