http://itmensf6tlh4ccibncmbeeidaaw7imhhsbovddstyujmfarks42bxiqd.onion/q/catalog.html
This, I'll say, is very similar to the cases when people ask me questions that I'll answer with "it depends" "it's not a good question" "I cannot answer your question". It's not that I can't give a "general answer", the point simply is that it depends, depends, in this case, on what it means that B and C have "identical acceleration" and for whom is it the case that B and C's distance is constant.