Correct Answer: AThe best solution for performing exploratory data analysis (EDA) on a petabyte of data, while avoiding the management of compute resources and paying only for queries run, is to use Apache Spark from within Amazon Athena. Amazon Athena allows users to run serverless queries and pay only for the data processed. Although Amazon SageMaker provides similar functionalities and supports Jupyter notebooks and Python, it does not align as closely with the requirement of paying only for the queries run. Instead, SageMaker can incur costs even when the resources are allocated but not actively used. Therefore, the correct choice is to use Apache Spark from within Amazon Athena.