Answer: Amazon Cognito

The correct answer is C, Amazon Cognito. Amazon Cognito is a service provided by AWS that allows developers to add user sign-up, sign-in, and access control to web and mobile applications. It supports social and enterprise identity federation, which means it can integrate with social media login credentials. This service is built on open identity standards and offers advanced security features to protect users and businesses. It is the recommended service for integrating social media logins with an online shopping website, as it provides a scalable identity store and integrates with various frontend and backend development resources.

Author: LeetQuiz Editorial Team