We would get B.
This happens because it's just another key detail, it's a detail that's aside of the sentence that may or may not be important.
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
hope this helps
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