The correct choice is AWS Cost Explorer. It provides interactive visualizations of historical spend and usage and surfaces Savings Plans purchase recommendations at the account and organization levels to help you choose an optimal commitment based on recent usage.

AWS Cost Explorer analyzes past cost and usage patterns and generates Savings Plans recommendations. It offers filters and charts so you can inspect usage by service and linked accounts and compare recommendation scenarios before you commit.

AWS Budgets is designed to set cost and usage thresholds and send alerts when budgets are breached and it does not generate Savings Plans recommendations from historical usage.

AWS Cost & Usage Report (AWS CUR) delivers the most granular billing records to an S3 bucket for detailed analysis and long term storage and it requires you to process the raw data yourself so it does not natively recommend Savings Plans.

AWS Pricing Calculator is intended for forward looking cost estimates of proposed architectures and it is not used to analyze past usage or produce Savings Plans recommendations.

Full AWS Practitioner Certification Question