I believe it might be B. Problem
Hi there! I'm glad I was able to help you!
You can use my example sentence if necessary.
"In order to bungee jump safely, you need <em>to be hooked up</em> to the bungee cord, to ensure you don't get hurt!"
I hope this somewhat helped you! I'm not 100% sure if I used "to be hooked up" in the right sense, but it sounds pretty okay.
Let me know if I could help you with any other sentences! :)
Well, i mean, they were close friends.