You have two Direct Connect connections and two VPN connections to your network.
Following are the details.
Site A is VPN 10.2.0.0/24 7224:7100 AS 65000 65000
Site B is VPN 10.2.0.252/30 7224:7300 AS 65000 
Site C is DX 10.0.0.0/8 AS 7224:7100 65000 65000
Site D is DX 10.0.0.0/16 AS 7224:7100 65000 65000 65000
Which site will AWS choose to reach your network?

Answer options:

A.Site A
B.Site B
C.Site C
D.Site D

Answer – B
Option B is correct because "7224:7300" denotes "High preference" and also has the longest prefix.
Hence all other options by default become invalid.
For more information on Route tables, one can visit the below URL
https://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_Route_Tables.html
Please refer to the below link on page 4
https://docs.aws.amazon.com/directconnect/latest/UserGuide/dc-ug.pdf