Answer - A.
This is given as a use case in the documentation.
When to Use CRR.
Cross-region replication can help you do the following.
Comply with compliance requirements-Although Amazon S3 stores your data across multiple geographically distant Availability Zones by default, compliance requirements might dictate that you store data at even greater distances.
Cross-region replication allows you to replicate data between distant AWS Regions to satisfy these requirements.
Minimize latency-If your customers are in two geographic locations, you can minimize latency in accessing objects by maintaining object copies in AWS Regions that are geographically closer to your users.
Increase operational efficiency-If you have compute clusters in two different AWS Regions that analyze the same set of objects, you might choose to maintain object copies in those Regions.
Maintain object copies under different ownership-Regardless of who owns the source object, you can tell Amazon S3 to change replica ownership to the AWS account that owns the destination bucket.
This is referred to as the owner override option.
You might use this option to restrict access to object replicas.
Option B is invalid since this is only used when you want to secure data at rest.
Option C is invalid since this is only used when you want to have a static web site in place.
OptionD is invalid since this will not help reduce latency.
