I'm not 100% sure but it could be: Voluntary Exchange takes place between buyers and sellers:
(btw I copied and pasted from the question so I didn't take any content :D)
After heavy shelling and bombing, Warsaw surrendered to the Germans on September 27, 1939. Britain and France, standing by their guarantee of Poland's border, had declared war on Germany on September 3, 1939. The Soviet Union invaded eastern Poland on September 17, 1939.
Getting attacked by the soviet union, hope this helped !!!!!
The correct answer for the question that is being presented above is this one: "b. Smokey Robinson." Among the following choices that was not a popular music act of the 1960s is the <span>b. Smokey Robinson. They are not popular at the time of 1960s</span>
