The correct answer is C, Amazon GuardDuty. Amazon GuardDuty is a managed threat detection service that continuously monitors and analyzes data across your AWS environment to protect your AWS accounts and workloads. It uses machine learning, behavior analysis, and threat intelligence feeds to identify potential threats. The service provides detailed security findings for visibility and remediation, helping to protect your resources, applications, and data. The other options are incorrect because Amazon Macie is for data privacy, AWS Config for resource inventory, compliance, and security analysis, and Amazon Inspector for automated security assessment for applications.