AWS Config is the correct service for tracking how AWS resource configurations change over time. It provides a detailed view of the configuration of AWS resources in your account, including how they are related to one another and how their configurations have changed over time.

Key features of AWS Config:

• Configuration History: Records configuration changes to AWS resources
• Configuration Snapshots: Takes periodic snapshots of resource configurations
• Compliance Tracking: Helps ensure resources remain compliant with desired configurations
• Relationship Mapping: Shows how resources are related to each other

Why other options are incorrect:

• AWS CloudTrail: Logs API calls and user activity, not resource configurations
• Amazon CloudWatch: Monitors performance metrics and logs, not configuration changes
• Amazon Inspector: Security assessment service for vulnerabilities, not configuration tracking

AWS Config is specifically designed for configuration management and change tracking across AWS resources.