Final answer:
Azure Alerts is the correct option to automatically send an alert if an administrator stops an Azure virtual machine.
Step-by-step explanation:
The correct answer is Azure Alerts. Azure Alerts can be used to automatically send an alert if an administrator stops an Azure virtual machine. Azure Alerts is a monitoring service in Microsoft Azure that enables you to create and manage alerts on various Azure resources, including virtual machines.
Azure Monitor, Azure Logic Apps, and Azure Functions are other services offered by Microsoft Azure, but they are not specifically designed for monitoring and alerting on virtual machine events.