The correct service for continuous security monitoring and automated compliance reporting is AWS Security Hub. It acts as a central hub that gives a consolidated view across the selected AWS services and automates compliance checks, making it ideal for the financial sector with strict regulatory compliance needs.

AWS WAF is mainly used to protect against common web exploits and would not provide the compliance reporting needed. AWS Config is used for configuration tracking and auditing but doesn't focus on security monitoring and alerts. Amazon CloudWatch provides monitoring for AWS cloud resources and applications, but it doesn't consolidate security alerts or automate compliance checks like AWS Security Hub.