Final answer:
Azure App Service allows building and hosting of web apps and APIs without managing infrastructure and supports multiple programming languages. It provides a scalable and secure environment, streamlining application development and deployment.
Step-by-step explanation:
The service that allows you to build and host web apps, mobile back ends, and RESTful APIs in the programming language of your choice without managing infrastructure is B. Azure App Service.
Azure App Service is a fully managed platform for building, deploying, and scaling web apps. You can quickly build web apps in a variety of programming languages such as .NET, .NET Core, Java, Ruby, Node.js, PHP, or Python. The service also allows for integration with other Azure services, providing a robust environment for developing sophisticated applications.
By using Azure App Service, developers can focus on their application code, while Azure handles the infrastructure, server maintenance, security, load balancing, and scaling. It simplifies the creation and deployment of web apps and APIs, making the development process more efficient and allowing developers to get their apps to market faster.