Answer:
The correct answer here is A) an agent.
Step-by-step explanation
A agent can be defined as a person who has been given the power to act and make decisions on behalf of another an individual or company.
A company may appoint a person( in some cases even his employees ) as an agent, where company will become the principal, and it will ask this agent to sign documents for the company , talk and make negotiations with vendors on behalf of the company. As in this case Mountain states distribution inc has hired Norris to act as agent to deal with customers and other company's, accepting deliveries etc.