Which of the following statements is TRUE when designing a business process flow? 

Answer options:

A. You can use up to 40 steps for each stage.
B. Each branch can be no more than 10 levels deep.
C. You can select an entity relationship when defining a process flow.
D. You can use a minimum of 30 stages per process, as well as a minimum of 30 steps per stage.

C

Reference: https://docs.microsoft.com/en-us/dynamics365/customer-engagement/customize/enhance-business-process-flows-branching