Create an interface VPC endpoint for Amazon SQS is the correct choice because it provides private connectivity from the VPC to Amazon SQS using AWS PrivateLink and ensures traffic remains on the AWS network without public IPs or internet routing.

A Create an interface VPC endpoint for Amazon SQS provisions elastic network interfaces in your subnets and routes SQS API traffic over the AWS backbone. This keeps traffic inside AWS, works across Availability Zones, and avoids the need for an internet gateway or public addresses.

Attach an internet gateway and use public IPs to reach Amazon SQS is incorrect because using an internet gateway requires public IP addressing and sends traffic over the public internet which conflicts with the security requirement.

AWS Direct Connect is incorrect because Direct Connect is aimed at linking on premises networks to AWS and it is not the simple VPC scoped private access mechanism that an interface endpoint provides for SQS.

Launch a NAT instance in a public subnet and route private subnets' default traffic through it is incorrect because a NAT instance still sends outbound traffic to the internet using public IPs and it adds operational and scaling overhead while failing to keep traffic solely on the AWS backbone.

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