Answer – D
The AWS Documentation mentions the following
Dynamically routed VPN connections use the Border Gateway Protocol (BGP) to exchange routing information between your customer gateways and the virtual private gateways. Statically routed VPN connections require you to enter static routes for the network on your side of the customer gateway
For more information on VPN Connections, please refer to below URL:
http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_VPN.html