E: The flow needs to be shared as it was created by another person.
A: To be available to your bots, flows must be stored in a solution in Power Automate. If you do not want to use the Default Solution for this purpose, you can move your flows to another solution.
Incorrect Answers:
C: The flow is already in the default solution in the default environment.
D: You move the flow, not export and import the solution.
Reference:
https://docs.microsoft.com/en-us/power-virtual-agents/environments-first-run-experience