Australia underwent a population boom because:
Australia was under the British 'empire' during the time. When the British prisons became overcrowded, many of them were shipped to Australia to live there. This increased the amount of people living in Australia exponentially, and eventually cities were founded
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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.
Frontiersman Daniel Boone (October 22, 1734-September 26, 1820) lived for several years in western Virginia. Boone was born near present Reading, Pennsylvania. In 1751, Boone’s family resettled in North Carolina on the North Fork of the Yadkin River. (That answers where he lived.)