You have created 3 VPC`s , VPC A , VPC B and VPC
C. There is a VPC peering connection between VPC B and VPC A and a separate peering connection between VPC A and VPC
C. Which of the following is true with regards to this VPC peering arrangement?

Answer options:

A.Instances launched in VPC B can reach instances in VPC C
B.Instances launched in VPC B can reach instances in VPC C if the right routing entries are present.
C.Instances launched in VPC B can reach instances in VPC C if the right Security Groups rules are present for the instances
D.Instances launched in VPC B can reach instances in VPC C via a proxy instance in VPC A

Answer – D
Since transitive peering is not allowed, you can use a proxy instance to forward the requests.
Options A,B and C are all invalid , because as per the AWS Documentation, this is the rule of transitive peering
For more information on VPC peering configurations, please visit the below URL
https://docs.aws.amazon.com/AmazonVPC/latest/PeeringGuide/invalid-peering-configurations.html