A free enterprise system is based on four key tenets which are private property rights, profit motive, equal individual rights and unrestricted competition. Property rights assure individuals that their property will not be confiscated by the state. The profit motive leads to competition which results in increased productivity
The students in Puerto Rico often reached the schools they are in through walking. So, the answer to the question above is letter A. They do this often as some of the schools are accessible this way. It is also said that walking around towns in Puerto Rico is quite safe.