AWS Firewall Manager is the correct service for centrally configuring and managing security groups across multiple AWS accounts within an organization. It provides:

• Centralized management of security groups across multiple AWS accounts
• Policy-based configuration for security groups
• Integration with AWS Organizations for account management
• Automated enforcement of security policies

Why other options are incorrect:

• Amazon GuardDuty: A threat detection service that monitors for malicious activity and unauthorized behavior
• Amazon Detective: Helps analyze security findings and identify root causes of security issues
• AWS WAF: A web application firewall that protects web applications from common web exploits

AWS Firewall Manager specifically addresses the requirement for centralized security group management across multiple accounts in an organization.