You open a new model-driven app in App Designer. 
Please select all canvas sections that App Designer provides for creating a model-driven app.

Answer options:

A.Dashboards
B.Forms
C.Entity View
D.Business Process Flows
E.Entities
F.Site Map

Correct Answers: A, C, D and F 
The App Designer for model-driven apps (Number 1) provides four main sections on a designer canvas: Site Map — you can define the app’s navigation using a site map designer (Number 2).
Dashboard — you can create dashboards for the app (Number 3).
Business Process Flow — you can create a business process flow for the app (Number 4).
Entity View – you can add entity assets (Number 5).
You can modify these components by clicking on the section, artifacts, and entity assets. 
Power Apps Designer provides two types of design components: Artifacts (Number 6) and Entity assets (Number 7). 
Artifacts include Entities, Dashboards, and Business Process Flow. Entity assets include Forms, Views, Charts, and Dashboards. 

All other options are incorrect. 
For more information about Power Apps Designer for model-driven apps, please visit the below URLs: 

https://docs.microsoft.com/en-us/powerapps/maker/model-driven-apps/design-custom-business-apps-using-app-designer
https://docs.microsoft.com/en-us/powerapps/maker/model-driven-apps/add-edit-app-components
https://docs.microsoft.com/en-us/powerapps/maker/model-driven-apps/build-first-model-driven-app