Which AWS service or feature can initiate an Amazon EC2 Auto Scaling action to achieve this goal?

Explanations:

Amazon Simple Queue Service (SQS) is used for message queuing and does not directly monitor CPU utilization or trigger Auto Scaling actions.

Amazon Simple Notification Service (SNS) is a messaging service used to send notifications, but it does not directly monitor metrics or initiate Auto Scaling actions based on CPU utilization.

AWS Systems Manager provides operational data and automation capabilities, but it does not specifically monitor metrics like CPU utilization or trigger Auto Scaling actions.

Amazon CloudWatch alarms can monitor CPU utilization and automatically trigger scaling actions in EC2 Auto Scaling groups based on specified thresholds.