Answer – C
The AWS Documentation mentions the following.
Amazon S3 Transfer Acceleration enables fast, easy, and secure transfers of files over long distances between your client and an S3 bucket. Transfer Acceleration takes advantage of Amazon CloudFront’s globally distributed edge locations. As the data arrives at an edge location, data is routed to Amazon S3 over an optimized network path.
For more information on S3 transfer acceleration, please visit the Link:
http://docs.aws.amazon.com/AmazonS3/latest/dev/transfer-acceleration.html
Options A, B and D are incorrect. These features deal with transferring data but not between clients and an S3 bucket.