Explanation

AWS Billing and Cost Management provides tools to help companies:

• Estimate the cost of a planned workload: AWS provides cost calculators and tools to estimate costs before deploying resources
• Generate alerts for costs that exceed defined thresholds: AWS Budgets allows setting custom cost and usage budgets with alerts

Why other options are incorrect:

• Manage access to AWS services and resources: This is handled by AWS Identity and Access Management (IAM), not Billing and Cost Management
• Estimate the costs of migrating data centers to the cloud: This is typically done using AWS Migration Evaluator or other migration-specific tools
• Conduct AWS Well-Architected Framework reviews: This is performed using the AWS Well-Architected Tool, which is separate from billing services