The correct answer is D, Amazon Elastic Container Service (Amazon ECS). ECS is a fully managed container orchestration service provided by AWS that supports Docker containers, allowing for easy deployment, scaling, and management of containerized applications. It abstracts away much of the operational overhead associated with container orchestration, such as cluster management and service discovery, making it a suitable choice for companies looking to minimize operational overhead. While option A could be a valid solution, it requires more management and operational overhead due to the need to handle the open source orchestrator setup and maintenance. Option B, AWS AppSync, is more focused on GraphQL and real-time data synchronization rather than container management. Option C, Amazon ECR, is a container registry service that allows you to store and manage Docker container images, but it does not provide orchestration capabilities.