The correct answer is D, Amazon DynamoDB. Amazon DynamoDB is a fully managed NoSQL database service provided by AWS that offers fast and predictable performance with seamless scalability. It is a good fit for applications that require high performance at any scale. Amazon Redshift (A) is a data warehousing service, AWS DataSync (B) is a data transfer service, and Amazon Athena (C) is an interactive query service that uses SQL to analyze data directly from S3, none of which are NoSQL databases.