The correct answers are B and C. Option B is correct because selecting Amazon EC2 instance types based on past utilization patterns helps to ensure that the instances are appropriately sized for the workload, which can prevent over-provisioning and reduce costs. Option C is also correct as using Amazon S3 Lifecycle policies to move less frequently accessed data to lower-cost storage tiers is a strategy to optimize storage costs without affecting data availability. Option A is not a rightsizing action but rather a service migration. Option D, Multi-AZ deployments, is about high availability and not directly related to cost optimization through rightsizing. Option E, replacing EC2 instances with Elastic Beanstalk, is about service management and not necessarily about rightsizing for cost control.