Answer:
In some counties, laws require retail stores to be closed on Sundays.
Step-by-step explanation:
Barriers to entry are factors which make it difficult for new competitors to enter a market. These are costs or obstacles which do not allow for a smooth incorporation. All of the options but B, specifically show an obstacle for each particular case which does indeed affect an entrepreneur, a future doctor, and a cable company to exercise what they are supposed to do. However, laws forbidding stores to be closed on Sundays does not specifically affect one person or company but everyone, and since not one single store is going to be open, there is no disadvantage for a new store nor advantages for the stores already in business.