Answer:
The answer is: letter B, Create a unified defense agreement against possible Soviet attacks.
Explanation:
"NATO" stands for "North Atlantic Treaty Organization." This was established in<em> 1949</em> in order <u>to counterbalance the armies of the Soviet.</u> These armies were stationed in eastern and central area of Europe. Many of the members signed an agreement that<u> if any of them gets attacked, they will have </u><u>a collective or unified self-defense of all the partied involved.</u> Such defense will extend towards the use of <em>armed forces</em> in order to secure North America and the European nations.
Those countries which have signed in agreement to the unified defense were <em>France, Belgium, Iceland, Denmark, Italy, Canada, West Germany, Spain, etc.</em>
Thus, this explains the answer.