The American citizens have duties required.
They have to understand their rights, because they have to know the law, in order to obey it. This means to know their rights and responsabilities.
It is very important to take education seriously, because it provides you understanding to know your rights and responsabilities, also gain knowledge to be able to work and help the economy.
Also they have to understand the meaning of being an active citizen.
Answer D.
To learn and understand foreign goverments and laws are responsabilities, but not duties of the citizens.