AWS CloudTrail is the correct answer because it provides detailed logs of API calls and user activity across AWS services, including Amazon Bedrock. CloudTrail records API calls made to Amazon Bedrock, which includes model invocations, access patterns, and other API activities. This helps with security analysis, resource change tracking, and compliance auditing.

Why other options are incorrect:

• B. Amazon SNS: This is a messaging service for application-to-application or application-to-person communication, not for logging API calls.
• C. AWS Outposts: This is a hybrid cloud solution that brings AWS infrastructure to on-premises locations, not a logging service.
• D. Route 53: This is Amazon's DNS web service, used for domain registration and routing, not for logging API activities.