The cheap labor in the form of slaves.
The answer is B purely due to this statement:
"secures the blessings of liberty" which is in the preamble. Also because it is defined as a natural right. Hope this helps and let me know if you need more help!
At the end of World War II, the Soviets occupied several other countries that were converted into satellite state. These countries were the People's Republic of Poland, the People's Republic of Hungary, the Socialist Republic of Czechoslovakia, the People's Republic of Romania, the People's Republic of Albania, and then East Germany from the German Soviet occupation zone.