You have configured a dynamic VPN between your datacenter and your VPC. Your router says the tunnel is up and BGP is active, but for some reason, you are not seeing your routes propagate.
What is most likely the issue?

A. You need to configure the firewall for BGP.
B. Your router does not support BFD.
C. You need to obtain a new BGP MD5 key.
D. You forgot to set route propagation to "yes" in the route table.