Which type of border would likely have the most protection a. state b. province c. national d. city

A national border would most likely have the most protection because nation's seek to prevent the import of illegal goods, movement of individuals into the country, and also to protect their borders against potential foreign invasion. Traditionally national borders would have more defenses, army, security forces, and police to protect the border than any of the rest of these borders.

:)

answer; i believe its (cpr);