Answer :
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.
They walk
Cause many students, parents, family cant afford the money to go on buses, bikes, or cars. Either school buses cause who knows if the school buses stop where they live
I hope this works
YW!