Which AWS service offering uses machine learning and graph theory capability on automatically collected log data to help you conduct faster and efficient security investigations?

Answer options:

A.Amazon Macie
B.Amazon Detective
C.AWS Artifact
D.Amazon GuardDuty

Answer: B
Option A is INCORRECT. Amazon Macie is a fully managed service from AWS that provides data security and privacy by utilizing Amazon’s machine learning and pattern matching capabilities.
Option B is CORRECT. Amazon Detective is a security service that uses machine learning capabilities on the automatically collected log data to help customers perform efficient and fast security investigations.
Option C is INCORRECT. AWS Artifact is a central resource for all the information about compliance. AWS artifact provides on-demand access to compliance reports at no additional cost.
Option D is INCORRECT. Amazon GuardDuty performs continuous monitoring to protect AWS account, S3 data and workloads from any malicious, unauthorized activities.
Reference: 
https://aws.amazon.com/macie/
https://aws.amazon.com/detective/faqs/
https://aws.amazon.com/artifact/
https://aws.amazon.com/guardduty/