Probably a or c idk but provably c
When young people migrate from a rural area which probably already is suffering from a low birthrate, this effectively eventually can create a "lack of life" in a certain place where after a decade or a few decades, a certain rural area can actually die out due to not enough young people being there anymore.
The Battle of Britain was the turning point.
During the French-Indian war (1754-1763) Quebec's natural defense was that it was stationed on a 200-foot cliff overlooking the St. Lawrence River. In the Battle of Quebec, British army scaled the cliffs and defeated French forces. Quebec was also the oldest French settlement in North America.
