Answer:
The correct option is A,monopoly power,a legal barrier to entry
Step-by-step explanation:
Monopoly power is the exclusive right granted to a business or a group of professionals in order to produce a particular good or provide a service.
The fact that no one else can give the go-ahead to purchase casket except the funeral directors is a form of monopoly.
However,this arrangement has a knock-on effect ,which is the legal barrier to entry. It is a legal barrier because it was created by law.
Option C is is wrong because the barrier is legal not natural barrier,natural barriers are usually as a result of exclusive ownership of major input of production