The correct answer is Amazon Aurora with read replicas because Amazon Aurora is a relational database service that supports read replicas, which allows the database to handle high read traffic by distributing the load across multiple instances. This provides both scalability for read-intensive workloads and high availability. Amazon Neptune does not support read replicas and is not intended for read-intensive relational database workloads, making it an incorrect choice. Amazon ElastiCache is a caching service, not a relational database, and cannot solely manage database read traffic. While Amazon RDS Read Replicas is a viable option for read scaling, Amazon Aurora offers better performance and scalability for read-intensive workloads, which is why it's the better choice in this scenario.