Why Shouldn't We Permit Members of the Public to Use

Why shouldn't we permit members of the public to use our freight elevators?

A) Freight elevators often lack many of the safety features present in a passenger elevator.
B) Freight elevators are usually too small to carry many passengers, and the addition of members of the public would overload the system.
C) There is no reason why members of the public should be prohibited from using freight elevators.
D) None of the above