Explanation

Amazon RDS (Relational Database Service) is the correct choice because:

• MySQL Compatibility: Amazon RDS supports MySQL as one of its database engines, allowing you to run MySQL databases in AWS
• Managed Service: RDS is a fully managed relational database service that handles database administration tasks
• Migration Support: RDS provides tools and features to easily migrate existing MySQL databases from on-premises to AWS
• Relational Database: Since the company is running MySQL (a relational database), RDS is the appropriate managed service

Why not the other options:

• Amazon Neptune: A graph database service, not suitable for MySQL relational databases
• Amazon ElastiCache (Redis) OPS: An in-memory caching service, not a relational database service
• Amazon DynamoDB: A NoSQL database service, not compatible with MySQL relational databases

Amazon RDS provides the most straightforward path for migrating and running a MySQL database copy in AWS while maintaining compatibility with the existing database structure.