Answer: B
Option A is INCORRECT. DynamoDB is a NoSQL Key-Value database. Dynamodb is a document database.
Option B is CORRECT. Redshift is a fully managed data warehouse offering from AWS that allows usage of standard SQL queries and existing BI tools. Redshift is suitable for OLAP.
Option C is INCORRECT. Aurora is a MySQL and PostgreSQL-compatible relational database service offering from AWS. Aurora is suitable for OLTP.
Option D is INCORRECT. RDS is a distributed relational database service. Aurora is an RDS service.
Reference:
https://aws.amazon.com/dynamodb/
https://aws.amazon.com/redshift/faqs/
https://aws.amazon.com/rds/aurora/
https://aws.amazon.com/rds/