Amazon Relational Database Service (Amazon RDS) is the correct answer as it provides a managed service that allows users to operate and scale a relational database in the cloud with ease. It handles routine database tasks such as provisioning, patching, backup, recovery, failure detection, and repair. Amazon Aurora, while also a managed relational database, is a specific type of RDS with a focus on performance and compatibility with MySQL and PostgreSQL. Amazon Redshift is a data warehousing service, Amazon DocumentDB is a document database service that supports MongoDB workloads, and Amazon DynamoDB is a NoSQL database service. Amazon EC2 does not automate database management tasks as it is a service for providing resizable compute capacity in the cloud.