The correct answer is: "It is essential to the country’s efforts to combat terrorism."
The USA Patriot Act was enacted in 2011 during the presidency of George W. Bush and after the September 11 attacks, aiming to enhance the strenght of the national security.
It has been really polemic as its provisions include authorization of indefinite detentions of immigrants, permission to search homes or businesses even without the knowledge of the occupant and permission to search phones, email or financial records. This is why the third and fourth options proposed cannot be correct answers.
Many legal challenges have been brought to court against this act, and some of its provisions have been considered unconstitutional.
The aim of the act was always to fight terrorism, not war prevention therefore the second option cannot be true. The first option is the one that best qualifies, although many would argue that this measure is not very good and something else should be done to fight terrorism.