You create a Power Virtual Agents chatbot. 
What must you have in your environment?

Answer options:

A.At least one Power Automate flow
B.Business process flow
C.At least one model-driven app
D.Dataverse database
E.Dynamics 365 apps

Correct Answer: D 
When you create a new chatbot, you need to have a Dataverse database installed in your environment. Power Virtual Agents service stores chatbot’s data and configuration in the Dataverse database. 
All other options are incorrect. 
For more information about Power Virtual Agents bots, please visit the below URL: 

https://docs.microsoft.com/en-us/learn/modules/power-virtual-agents-bots/2-get-started