BGP between multiple peers

Hello,

My current situation with BGP and multiple peers: Me is A

Internet -> C -> B -> A

This is the current situation that the traffic/route will get to me, But indeed i also have direct peer

Internet - > C -> A So It can actually Internet -> C-> A But based on the current situation and without special community or local perference, It goes this way: Internet -> C -> B -> A

But i want to have Internet -> C-> Abut not affecting B -> A (which is B -> C -> A that i dont want that happens unless the connection is down) Should i look at BGP community, or local preference? Currently want to get the right direction of solving this problem.

Thanks for your help.

EDIT: Seems my question is not clear enough so i explain more here: B is actually transit, C is actually IX. So A (me )and B both have peers to this IX (C). the real problem is that i dont want the traffic from C that go though B and then to me. May try prepending.