To determine which application model follows Blue Prism Best Practices, it's essential to consider the organization and clarity of the application elements. Blue Prism Best Practices emphasize the importance of clarity in application models by clearly delineating actions and differentiating element types such as inputs and buttons. Among the provided options, Application Model B is the most organized. It groups related elements together under clear headers like 'Log in Window', 'Options Window', 'New Order', and 'Order Confirmation', and specifies the types of elements (input, button, screen text). This organization enhances readability and maintainability of the automation project. Hence, the correct answer is B.