I would say the answer is C. The government
All states require candidates for barber licenses to take and pass a state barber examination, which may be a state-designed examination, the national examination through the National-Interstate Council of State Boards of Cosmetology (NIC), or a combination of the two.
Upon the successful completion of a barber program or apprenticeship, candidates for barber licensure must successfully take a state license examination, which generally consists of a written (theory) section and a practical (hands-on) section. Some states utilize the written and/or practical examinations offered through the National-Interstate Council on State Boards of Cosmetology (NIC).