Which AWS tool lets a company visualize and analyze its AWS costs and usage over a chosen time period?

Cost Explorer is the correct answer because it is a free tool that allows you to visualize, understand, and manage your AWS costs and usage over time. You can use it to analyze historical data, identify trends, and forecast future costs. Consolidated billing is a feature of AWS Organizations that combines billing for multiple accounts into a single bill, but it doesn't provide detailed visualization or analysis. AWS Organizations helps you centrally manage multiple AWS accounts, but it's not primarily a cost analysis tool. AWS Budgets allows you to set custom budgets and receive alerts when your costs or usage exceed your budgeted amounts, but it relies on data from Cost Explorer for its analysis and doesn't offer the same level of detailed visualization.