The correct answer is B, AWS Knowledge Center. This is because the AWS Knowledge Center serves as a central repository where users can find answers to frequently asked questions about various AWS services, including those related to security in the AWS Cloud. It provides a wide array of information such as best practices, tutorials, troubleshooting guides, FAQs, and whitepapers. The other options do not match the criteria: A (AWS Trusted Advisor) offers recommendations but not a FAQ section, C (AWS Support Center) is for case management and documentation but not specifically for FAQs, and D (AWS Artifact) provides compliance reports rather than FAQs.