Which AWS service will meet this requirement?

Explanations:

AWS Lambda is a compute service that allows you to run code without provisioning servers. It does not provide identity management or social media sign-in features.

Amazon Cognito is a service designed for user authentication and management, allowing users to sign in through social media identity providers, such as Facebook or Google.

AWS Secrets Manager is used for managing and retrieving secrets, such as API keys and passwords, but it does not handle user authentication or social sign-in.

Amazon CloudFront is a content delivery network (CDN) that accelerates the delivery of web content but does not provide any identity management or authentication services.