The correct choice is AWS Direct Connect because it provides a dedicated private network connection from the on premises data center into AWS that does not traverse the public internet.

AWS Direct Connect establishes a physical or hosted connection to AWS which delivers more consistent bandwidth and lower latency than going over the internet, and it keeps traffic on a private path into AWS rather than using public networks.

AWS VPC Endpoint allows private access to supported AWS services from resources inside a VPC but it does not link an on premises network to AWS so it cannot provide the required dedicated private circuit.

AWS Site-to-Site VPN uses encrypted tunnels over the public internet so it provides secure connectivity but it still traverses the internet and therefore is not a private physical link.

AWS Transit Gateway functions as a central routing hub to connect multiple VPCs and on premises networks but it does not by itself create a private circuit and it depends on attachments such as Direct Connect or VPN for the actual link.

Full AWS Practitioner Certification Question