Final answer:
The direct interaction region of a process chain involves process steps that require direct communication and interaction between participants. Option C
Step-by-step explanation:
The region of a process chain that includes the process steps involving interaction between participants is the direct interaction region.
In this region, participants directly communicate and exchange information and resources to complete the process chain.
For example, in a customer order process chain, the direct interaction region would include the steps where the customer interacts with the sales representative to place an order. Option A