A state recently passed laws allowing the use of medical marijuana by prescription from a licensed physician. Several businesses seek to open dispensaries; however, part of the licensing statutes require that the business have a licensed pharmacist on staff and present at all times the dispensary is open. The businesses feel this is an unreasonable requirement, as the product is sold for recreational use in other states. Which of the following public policy arguments best supports the state's decision to keep the pharmacist requirement?

a. It helps promote public welfare.

b. It will help protect workers.

c. It will help promote economic growth.

d. It helps promote consumer welfare.