Answer:
A. Research and​ development, Design of products and​ processes, Production,​ Marketing, Distribution, and Customer service.
Explanation:
The business functions in the value chain are:
-Research and development: Explore new ideas.
-Design of products and​ processes: Plan the new products, services and processes.
-Production: Transform all the resources to get the product or deliver a service.
-Marketing: Present and sell the product or service.
-Distribution: Deliver the product or service to the customers.
-Customer Service: Provide support to customers.