Which AWS service or feature will meet these requirements?

Explanations:

S3 bucket ACLs can be used to control access to the bucket, but they do not prevent direct access to the S3 website. Visitors could still access the S3 bucket directly if they know the URL.

AWS Firewall Manager is designed for managing security policies across AWS accounts and does not directly control access to S3 buckets or CloudFront distributions. It is not applicable for restricting S3 access to CloudFront.

An Amazon Route 53 private hosted zone is used for managing DNS within a private network and does not provide any mechanism to restrict access to an S3 bucket via CloudFront. It does not apply to the requirement of securing S3 access.

Origin access identity (OAI) is a special CloudFront feature that allows you to restrict access to the S3 bucket so that only requests coming through CloudFront can access the bucket. This ensures that users cannot access the S3 website directly.