The answer to this is A. You have to be at the age of 18 in order to get a salesperson license. Why do you need this type of license anyway? This will allow you to have the authority to sell items even if you are still young. Let us say that you want to start selling cars. You cannot do this without the right license.
Take note that for the salesperson license, you can only sell vehicles to dealers who are selling cars and not directly to customers. If you would like to take it one step further and start selling cars, you need to get a dealer license instead.
You would need to pay $50 to get the license to become a salesperson. It would cost the same for reinstatement. A transfer fee would cost $15. It is best that you know about the costs to prepare for getting this license ahead of time.