The service that allows for interactive SQL querying of data residing in a simple object storage is Amazon Athena. It's a serverless service that requires no setup and operates on a pay-per-query basis, charged according to the amount of data scanned. Amazon Redshift is a powerful data warehouse service that suits large-scale data storage and analytics but is not designed for querying data directly in object storage without prior data loading operations. Amazon RDS provides managed relational databases but does not facilitate direct query execution on object storage. AWS Glue is primarily an ETL service for data preparation, not for ad-hoc query executions.