Answer:
c) "...it is of infinite moment that you should properly estimate the immense value of your national union to your collective and individual happiness; that you should cherish a cordial, habitual, and immovable attachment to it;"
Explanation:
The "Farewell Address" of George Washington was written when he was about to retire as the President of the United States. It was meant to give people an advice regarding internal factions or divisions and the country's relationship with foreign nations.
Among the choices mentioned, choice c highly supports Washington's belief that national unity is of highest importance. It tells people that national union should also mean "individual's happiness" and for this, people should all-together aim to have such unity. They should also cherish it and make it an important aspect of their lives.
So, this explains the answer.
