You want to create a new canvas app and think about what data source to use. Your choice is between SharePoint lists and Dataverse tables for moderate size data. 
Why should you use the Dataverse instead of SharePoint as a data source for your application? 
Please select all that apply.

Answer options:

A.Metadata
B.Scalability
C.Complexity
D.Business rules
E.All the above

Correct Answers: A, B and D 
Power Apps have tight integration between SharePoint and the Dataverse. You can create a canvas app directly from SharePoint. It is also easy to create a canvas app from the Power Apps Studio using the Dataverse. Each of the data sources has its benefits. But users can enjoy more benefits that Dataverse provides for canvas apps than SharePoint.
Option A is correct because Dataverse`s rich metadata helps the canvas app use the data types and relationships for setting the app`s fields or using Dataverse`s Choices directly in the app`s controls.
Option B is correct because the Dataverse can scale easily to the large datasets that could create a problem for the SharePoint lists.
Option D is correct because you can use logic and data validation from the business rules that are the parts of the Dataverse.
All other options are incorrect. 
For more information about a Dataverse data source for canvas apps, please visit the below URLs: 

https://docs.microsoft.com/en-us/learn/modules/get-started-with-powerapps/3-powerapps-related-technologies
https://docs.microsoft.com/en-us/powerapps/maker/canvas-apps/data-platform-create-app
https://docs.microsoft.com/en-us/powerapps/maker/canvas-apps/app-from-sharepoint