Most slaves lived on plantations, but the plantations were not very big: they rarely had more than 100 slaves. The best answer is then A. lived on plantations with 20 or more slaves.
The British colonisation in North America were the 13 colonies north east coast and they were divided in to 3 different colonies New England,Middle, and Southern they all left England to search for a better life.
Hope this could help:)
The correct answer is B. The iron curtain divided The Soviet Union from the rest of Europe. This contributed to their fall.