Which AWS service is primarily utilized for data synchronization across AWS regions?

The correct choice is Amazon S3 Cross-Region Replication (CRR) because it is specifically designed to facilitate the automatic, asynchronous copying of objects across different AWS regions. This service ensures that data is available in multiple geographical locations, which can enhance data redundancy and accessibility while ensuring compliance with regional data governance regulations. Additionally, CRR allows for the replication of newly created objects as well as existing objects, thereby providing a comprehensive solution for data synchronization across regions.

Other options either serve different purposes or are not specifically focused on cross-region data synchronization. For instance, Amazon S3 Replication pertains primarily to replication within the same region or from a source bucket to a target bucket in the same region, while Amazon EC2 Sync is not a recognized AWS service for data synchronization; it might confuse with file synchronization tools for EC2 instances. AWS Data Pipeline is designed for managing and automating complex data workflows across different AWS services rather than focusing purely on data replication or synchronization tasks. Thus, the focused functionality of CRR makes it the optimal choice for this particular requirement.