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The correct choice highlighting the appropriate feature for receiving email alerts when an application fails to return a status code of 200 is tied to the concept of monitoring application availability. Using Availability tests allows you to set up specific checks against your application, such as pinging URLs at defined intervals to determine if the application is up and returning the expected responses. If the application does not respond with a status code of 200, alerts can be configured to notify relevant stakeholders via email, enabling a quick response to potential issues.

Service Map, while useful for visualizing the communication between different services and their dependencies, does not provide the capability to monitor application availability in a way that would send alerts based on status codes. The Profiler tool is focused on performance monitoring and diagnostics, helping you analyze the performance of your application but not alerting based on availability criteria. Similarly, although the Application Map provides an insight into the interactions and health of your application components, it does not serve the specific purpose of monitoring availability through alerts for non-200 responses.

Thus, the Availability tests feature is explicitly designed for this purpose, making it the most suitable option for receiving email alerts regarding application health and response codes.