According to Graham Allison book, Nuclear Terrorism, only 5 percent of daily cargos into the U.S are screened where every day 30,000 trucks, 6500 rail cars and 140 ships deliver over 50,000 cargo containers into the United States. This rarely involves physical inspection which may not detect nuclear weapons and fissile materials.
The Confederation System.
The Confederation System had a loose relationship with other political units or the states that existed within the country at the moment, such as federal governments.
Hope this helps!
A is the right answer. Ya